I was developing my extension but, sadly there is a problem, it builds successfully but, when I upload it on appinventor, no error is shown except this 0 error
I checked my code several times but, there is no specific error
It is definitely a problem with extension, even if it is the same in other builders. Other extensions do not cause this error so have a good look at the code. Just because it compiles doesn't mean it will work well with AppInventor. If you want help, you should post the problem code.