Thank you for your bug report, kennywu.

This is a bug in ver 5.2.1 and I am afraid that it is unable to import a class that has methods with annotated parameters.
This bug will be fixed in next release. (5.3Beta is now available and this bug is fixed in it already)

Though Beta version is available for testing and evaluation purposes only and we do not recommend you to modify or overwrite existing project files in beta as once you do, these files may not open in other versions.

Download & Update Information is available at our website!

Best regards,
Satomi