You have not provided any system info or details about your project, so nobody can even begin to guess. that aside try the usual - open the project with capslock or import it into an empty project, flush the disk caches, trash the prefs to reset potentially borked settings.
So the error message doesn't explain the error itself?
When I used to be a software developer, my programs' error codes used to identify what the problem was.
Mobo: Asus P9X79 Pro
Processor: Intel Core i7 3930K
RAM: G.SKILL Ripjaws Z Series 32GB (8 x 4GB) 1866
Boot drive: Samsung 256GB 830 SSD SATA 6GBPS 2.5 inch
OS: Windows 7-64 bit
AE CS6 v 22.214.171.124
Red R3D footage
Originally edited in Premiere CS6, then imported into AE CS6.
Was working OK until yesterday's changes, which were to pre-comp a short clip.
In the pre-comp add an Adjustment Layer.
Add a mask to this layer, keyframe Mask Shape
Add Curves to Adjustment Layer
Then change the frame that the current time indicator is on.
I have just updated to v126.96.36.199 and it still crashes.
The error number is now different, although the message is the same:
"After Effects error: Crash in progress. Last logged message was: <3016> <StateBinaryConverter> <5> solveCompleteB = 1"
If I open it using CapsLock, then turn off the Curves effect, then turn CapsLock off, it doesn't crash.
I then move to a different frame and turn Curves back on, and it is OK.
And I can go to several other frames with no trouble.
But as soon as I click on that one specific frame... CRASH!
Curiouser and curiouser...
If I remove the Curves and use Levels instead, it also crashes on just that one frame.
With the error:
After Effects error: Crash in progress. Last logged message was: <6616> <StateBinaryConverter> <5> solveCompleteB = 1
In case it is relevant, the project is 32-bit colour.
I have got around it for now by putting the comp in a new project, then importing that project into the original project. Now it doesn't crash.
But this is a ridiculous thing to have to do!!!