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  1. Asked: May 11, 2022In: Programs

    Stabilizing the error: no handles with labels found to put in legend with the best answers

    dhtutoria Expert
    Added an answer on June 2, 2022 at 11:16 am
    This answer was edited.

    The cause: The cause of the error was using method plt.legend() Solution: You need to change plt.legend() into ax.legend() as the following code: fig = plt.figure() ax = fig.add_subplot(111) ax.spines['left'].set_position('zero') ax.spines['right'].set_color('none') ax.spines['bottom'].set_position(Read more

    The cause: The cause of the error was using method plt.legend()

    Solution: You need to change plt.legend() into ax.legend() as the following code:

    fig = plt.figure()
    ax = fig.add_subplot(111)
    ax.spines['left'].set_position('zero')
    ax.spines['right'].set_color('none')
    ax.spines['bottom'].set_position('zero')
    ax.spines['top'].set_color('none')
    plt.axis([-5,5,-5,5])
    ax.xaxis.set_ticks_position('bottom')
    ax.yaxis.set_ticks_position('left')
    plt.grid()
    plt.arrow(0,0, 3,1, head_width=0.2, color='r', length_includes_head=True, label='u')
    plt.arrow(0,0, 1,3, head_width=0.2, color='r', length_includes_head=True, label='v')
    plt.arrow(0,0, 4,4, head_width=0.2, color='r', length_includes_head=True, label='u+v')
    ax.legend()

     

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  2. Asked: May 12, 2022In: Programs

    Steps to fix the error “ the authenticity of host can’t be established”

    dhtutoria Expert
    Added an answer on June 2, 2022 at 10:55 am
    This answer was edited.

    The cause: I think this error occurs if you frequently edit keys, this warning will appear owing to security features; do not disable this feature. This warning only appeared once. If the problem persists after a second connection, the issue is most likely with writing to the known_hosts file. AfterRead more

    The cause: I think this error occurs if you frequently edit keys, this warning will appear owing to security features; do not disable this feature. This warning only appeared once. If the problem persists after a second connection, the issue is most likely with writing to the known_hosts file. After that, you’ll receive the following message:

    Failed to add the host to the list of known hosts 

    The solution: To solve this problem you can change the file’s owner or make it writable by your user by fixing the file’s permissions.

    sudo chown -v $USER ~/.ssh/known_hosts
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  3. Asked: May 12, 2022In: python

    The complete guide to the syntaxerror: multiple statements found while compiling a single statement issue

    dhtutoria Expert
    Added an answer on June 2, 2022 at 3:57 am
    This answer was edited.

    The cause: I think the reason for this is that you can't execute more than one statement at a time in the shell: >>> a = 2 b = 3 SyntaxError: multiple statements found while compiling a single statement The solution: To solve this problem, you must carry them out one by one: >>> aRead more

    The cause: I think the reason for this is that you can’t execute more than one statement at a time in the shell:

    >>> a = 2
    b = 3
    SyntaxError: multiple statements found while compiling a single statement

    The solution: To solve this problem, you must carry them out one by one:

    >>> a = 2
    >>> b = 3
    >>>
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  4. Asked: May 12, 2022In: javascript

    Can I fix the “router.use() requires a middleware function but got a object” or not?

    dhtutoria Expert
    Added an answer on June 2, 2022 at 3:37 am

    The cause: This error happens because of missing router exports module  The solution: I think you should use module.exports = router; and that would work

    The cause: This error happens because of missing router exports module 

    The solution: I think you should use module.exports = router; and that would work

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  5. Asked: May 12, 2022In: javascript

    Error: npm err! cb() never called! – Quick tips

    dhtutoria Expert
    Added an answer on June 2, 2022 at 3:33 am
    This answer was edited.

    The cause: I think this error happens perhaps because the engine you were using for Node was outdated. The solution: These steps below will help you solve this error: Clear your npm cache: sudo npm cache clean -f Install the latest version of the Node helper: sudo npm install -g n Tell the helper (nRead more

    The cause: I think this error happens perhaps because the engine you were using for Node was outdated.

    The solution: These steps below will help you solve this error:

    1. Clear your npm cache: sudo npm cache clean -f
    2. Install the latest version of the Node helper: sudo npm install -g n
    3. Tell the helper (n) to install the latest stable version of Node: sudo n stable

    You will be up to date if you get a progress display  

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  6. Asked: May 12, 2022In: typescript

    no value accessor for form control with unspecified name attribute – Simple solution when encountering the error

    dhtutoria Expert
    Added an answer on June 2, 2022 at 2:13 am

    The cause: The cause of this error perhaps is due to using [formControl] instead of [formGroup] The solution: To solve this error, you should change [formControl] to [formGroup] This is a wrong code: @Component({ selector: 'app-application-purpose', template: ` <div [formControl]="formGroup">Read more

    The cause: The cause of this error perhaps is due to using [formControl] instead of [formGroup]

    The solution: To solve this error, you should change [formControl] to [formGroup]

    This is a wrong code:

    @Component({
      selector: 'app-application-purpose',
      template: `
      <div [formControl]="formGroup"> <!-- '[formControl]' IS THE WRONG ATTRIBUTE -->
        <input formControlName="formGroupProperty" />
      </div>
      `
    })
    export class MyComponent implements OnInit {
      formGroup: FormGroup
    
      constructor(
        private formBuilder: FormBuilder 
      ) { }
    
      ngOnInit() {
        this.formGroup = this.formBuilder.group({
          formGroupProperty: ''
       })
      }
    }

    I have changed this to the right code as below:

    @Component({
      selector: 'app-application-purpose',
      template: `
        <div [formGroup]="formGroup"> <!-- '[formGroup]' IS THE RIGHT ATTRIBUTE -->
          <input formControlName="formGroupProperty" />
        </div>
      `
     })
     export class MyComponent implements OnInit {
       formGroup: FormGroup
    
       constructor(
         private formBuilder: FormBuilder
       ) { }
       ngOnInit() {
         this.formGroup = this.formBuilder.group({
           formGroupProperty: '' 
         })
       }
     }
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  7. Asked: May 12, 2022In: python

    Error: typeerror: __init__() missing 1 required positional argument: ‘on_delete’ – How to solve it?

    dhtutoria Expert
    Added an answer on June 2, 2022 at 12:56 am
    This answer was edited.

    The cause: This error happens because on delete became a necessary argument in Django 2.0, which was released after version 1.9. The default is CASCADE in previous versions. The solution: To resolve this error,  the property  categorie of the class Article should be change as the following: categoriRead more

    The cause: This error happens because on delete became a necessary argument in Django 2.0, which was released after version 1.9. The default is CASCADE in previous versions.

    The solution: To resolve this error,  the property  categorie of the class Article should be change as the following:

    categorie = models.ForeignKey('Categorie', on_delete=models.CASCADE)
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  8. Asked: May 12, 2022In: javascript

    How to fix “rendered more hooks than during the previous render”

    dhtutoria Expert
    Added an answer on June 2, 2022 at 12:26 am
    This answer was edited.

    The cause: This error happens because of within the onClick as the setAllResultsVisible is called, it will trigger state change and result on every render The solution:  Before setAllResultsVisible, you should change your onlick event add()=>  <p onClick={() => setAllResultsVisible(!allResuRead more

    The cause: This error happens because of within the onClick as the setAllResultsVisible is called, it will trigger state change and result on every render

    The solution:  Before setAllResultsVisible, you should change your onlick event add()=> 

    
    <p onClick={() => setAllResultsVisible(!allResultsVisible) }>
        More results v
    </p>

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  9. Asked: May 12, 2022In: python

    Simple solutions for the oserror: [winerror 193] %1 is not a valid win32 application error

    dhtutoria Expert
    Added an answer on June 2, 2022 at 12:17 am
    This answer was edited.

    The cause: This error happens because  the file hello.py  is not an executable file. then you have to specify the executable: subprocess.call(['python.exe', 'hello.py', 'htmlfilename.htm']) The solution: To resolve this error you'll need python.exe to be in the search path, or you can specify the enRead more

    The cause: This error happens because  the file hello.py  is not an executable file. then you have to specify the executable:

    subprocess.call(['python.exe', 'hello.py', 'htmlfilename.htm'])

    The solution: To resolve this error you’ll need python.exe to be in the search path, or you can specify the entire path to the executable file running the calling script:

    import sys subprocess.call([sys.executable, 'hello.py', 'htmlfilename.htm'])
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  10. Asked: May 12, 2022In: Programs

    Why do I get the trouble “ora-65096: invalid common user or role name”?

    dhtutoria Expert
    Added an answer on June 2, 2022 at 12:08 am

    The cause: You have to  create the database as a container database instead of creating user in the container, i.e. CDB$ROOT, however, i think you should create the user in the PLUGGABLE database. The solution: You can resolve the error by  creating a "pluggable user" aka "local user". Local users bRead more

    The cause: You have to  create the database as a container database instead of creating user in the container, i.e. CDB$ROOT, however, i think you should create the user in the PLUGGABLE database.

    The solution: You can resolve the error by  creating a “pluggable user” aka “local user”.
    Local users belong only to a single PDB. These users may be given administrative privileges, but only for that PDB inside which they exist. For that, you should connect to pluggable datable like that:

    alter session set container = nameofyourpluggabledatabase;

    and now, you can create user like usually:

    create user username identified by password;

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