React Error – Each child in a list should have a unique “key” prop
Akash Mittal
React throws error, each child in a list should have a unique “key” prop when you do not provide key prop in the list item. Let’s understand what this is…
React Error – cannot read property ‘setstate’ or ‘state’ or ‘props’ of undefined
So, you got the React error – cannot read property ‘setstate’ or ‘state’ or ‘props’ of undefined? Alright. Let’s see why it happens and how to solve it. We use…
React typeerror: cannot read property ‘map’ of undefined
React throws typeerror: cannot read property ‘map’ of undefined, when we try to use anything but arrays. According to MDN documentation – The map() method creates a new array populated with the results of…
React – Expected an assignment or function call and instead saw an expression no-unused-expressions
React throws the error “expected an assignment or function call and instead saw an expression no-unused-expressions” in the situations when we wrongly put parenthesis () and curly braces {}. You…
‘float’ object is not subscriptable – Python Error
‘float’ object is not subscriptable is a Python type error which occurs when you try to access “index” on float variables. This code will throw, ‘float’ object is not subscriptable…
‘float’ object is not callable – Python TypeError
Python throws the error, ‘float’ object is not callable when you try to call a float value as function. This happens when you use reserved keywords as your variable name…
‘conda’ is not recognized as an internal or external command, operable program or batch file.
You get the Python Anaconda error, ‘conda’ is not recognized as an internal or external command, operable program or batch file, when the path variable in environment is not set…
‘numpy.ndarray’ object is not callable – Python Error
So you are getting this numpy python error ‘numpy.ndarray’ object is not callable. Right? This is because somewhere in your code you are using a non-function element like int, array,…
(list) object cannot be coerced to type ‘double’ – R Error
R-language throws error (list) object cannot be coerced to type ‘double‘ when we try to convert a list of string or other type values to a numeric vector. To correctly…
‘builtin_function_or_method’ object is not subscriptable – Python TypeError
You generally get typeerror ‘builtin_function_or_method’ object is not subscriptable in Python when you try to use function as array. The above code will generate ‘builtin_function_or_method’ object is not subscriptable error…
‘int’ object is not callable – Python TypeError
Python throws the error, ‘int’ object is not callable when you try to call an integer as function. This happens when you use reserved keywords as your variable name or…
$ operator is invalid for atomic vectors – R Error
In R language, you get the error, “$ operator is invalid for atomic vectors” when you try to apply $ to a non-recursive object. As in the R language documentation…
‘int’ object is not subscriptable – Python Error
‘int’ object is not subscriptable is a Python type error which occurs when you try to access “index” on int variables. This code will throw, ‘int’ object is not subscriptable…
‘python’ is not recognized as an internal or external command, operable program or batch file.
When you install python, sometimes you get this error – “‘python’ is not recognized as an internal or external command, operable program or batch file.” This is because either the…
! [remote rejected] master -> master (pre-receive hook declined) – Git Error
! [remote rejected] master -> master (pre-receive hook declined) is the error we receive when either the branch is marked protected or you don’t have permission to push. According to…
! [rejected] master -> master (non-fast-forward) – Git Error
! [rejected] master -> master (non-fast-forward) error indicates that in order to complete your commit request, git has to lose some previous commits. This is not good because it leads…
! [rejected] master -> master (fetch first) – Git
! [rejected] master -> master (fetch first) is a Git error which indicates that you need to fetch the repository first before committing to it. In Git, sometimes you get…
Numpy random.rand to generate multidimensional random array in Python
Python Numpy random.rand can generate a multidimensional random array matrix of size equal to the provided input tuple. So, for example, if you provide (3,2) then it will generate a…
valueerror: expected object or value – Python Pandas
When reading JSON as pandas dataframe, we sometimes get the valueerror: expected object or value. The primary reasons for this error are – JSON file path is not correct. Error…
Java SimpleDateFormat – SSSXXX
The Java SimpleDateFormat class can represent many date formats including SSSXXX. Each letter in the date can signify date, time, timezone or some other things. SSSXXX represents milliseconds and timezone.…