I encounter the error ”left of must have class/struct/union” when I run the following line: void MainWindow::on_addEmployee_clicked() { DatabaseControl myDBControl(); myDBControl.addEmployee(); } Can someone help me to solve it? Thanks!

Today I get the ”uncaught typeerror: cannot read property ‘value’ of null” error when I command this line: var inputVal = document.getElementById("input").value; Then I receive the error message: TypeError: Cannot read property 'value' of null Can ...

I’m receiving this error: This declaration has no storage class or type specifier.  Here is my code: #include <iostream> #include <fstream> #include <iomanip> #include <string> #include <cstdlib> #include <vector> #include <map> using namespace std; class Message { public: void check(string side) { ...

This morning, when I running my code, I get the ”program received signal sigsegv: segmentation fault – invalid memory reference.” error. When I run the code with small L’s like L=16 or L=32, I receive no errors, but when I ...

This morning, when I am running my program, I get the error ”no such table: django_session”. On my server, two Django websites are active, both through Apache and using various virtual hosts on two ports that are supplied by my Nginx ...

I’m trying to work around this issue ”invalid comparison between dtype=datetime64[ns] and date” that I am facing here. #import libraries from __future__ import division from datetime import datetime, timedelta,date import pandas as pd %matplotlib inline from sklearn.metrics import classification_report,confusion_matrix import matplotlib.pyplot as plt import ...

I encounter ”Cant perform a react state update on an unmounted component” error when fetching of data is started and the component was unmounted, but the function is trying to update the state of the unmounted component.