We can't know. you have not provided any proper system information or exact version info for AE and mocha.
Sorry. System is Windows 7 x64, version of ae 126.96.36.199, version of mocha 3.2.1 .
I cant move forward with project. I think this kind of problem must be common for all users, so it would be great to find possible solution.
I'm experiencing exactly the same problem. AE cc2015 & mocha...
"AEGP Plugin MochaShapeConverter : Failed to build correct mocha shape data.
( 5027 :: 12 )"
What's the deal here?
The deal is that you're probably running AE CC 2015. The application is a train wreck. Abandon it in favor of AE CC 2014, which you have access to via the cloud. Use it instead.