how to solve this javascript erroe?

Hello,

I got this javascript error when clicking on next year button in year view schedular

Webpage error details

Message: '__pendingCallbacks[...].async' is null or not an object
Line: 163
Char: 13
Code: 0
URI: http://localhost:2926/Demo/WebResource.axd?d=_e9-vJXY_YhtZFdCKP5a3Q2&t=634260434897031250

please provide me solutions.

Thanks,

varsha