Plutonium

if anyone knows how to fix this i would greatly appreciate it.

i was playing bo2 and i got a cool gun so i pressed f12 instincualy as that is take a screenshot on steam and then it brought up a menu i couldent get out of so i had to click on the only thing that worked which was a box named exit and then it closed the game and ever sence i did that it wont work and i keep getting this error message:

Crash ID: 4f5556557f0746788840be15b5de8b1b
System.Threading.Tasks.TaskCanceledException: A task was canceled.
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Plutonium.Updater.Core.HTTP.<GetJsonAsync>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at Plutonium.Updater.Core.Updater.<Run>d__24.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Plutonium.Updater.App.Windows.UpdateWindow.<UpdateWindow_Loaded>d__6.MoveNext()