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My least helpful bug message that I encounter over and over AGAIN in my programming life over the past 30 years
"Object reference not set to an instance of an object."
At least tell me the name of the object for Christ's sake! especially if I've put the app out in debug mode!
@XSGeek - 
I'll accept javascript because I have to, but Typescript will be my FE language of choice going forward.
No More Ruby!
PHP: Never again.
@XSGeek - Sublime is just a wannabe notepad++ for users of lesser operating systems.
@XSGeek - still better than weakly typed languages that will just accept this and then fail later, deeper in the code.