Swift NSTimer is crashing my program with EXC_BAD_ACCESS -


ios noob here - trying run background timer in swift. below code generates error message: thread 1: exc_bad_access (code=1, address=0xd)

it has userinfo , i've tried using nil no success.

@ibaction func startbutton(_ sender: anyobject) {     timer = timer.scheduledtimer (         timeinterval: 0.01,          target: any.self,          selector: #selector(viewcontroller.whilerunning),          userinfo: any?.self,          repeats: true     ) }

reading following documentation not helpful:
https://developer.apple.com/reference/foundation/timer/1412416-scheduledtimer#discussion

the whole point of move element around storyboard on time using x coordinates.


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