Failed to load module 'Helper Bundle' after running some test cases in EarlGrey2

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Hello,
My Application crashed at the GREYHostApplicationDistantObject extension after running some test cases and got "Thread 1: EXC_BAD_ACCESS (code=2, address=0x7ff80d9f4ac8)". When I try to print "Bundle(for: (typeof:self))", I got

warning: Swift error in scratch context: error: failed to load module 'Here is my Helper Bundle'
.
Shared Swift state for BizX Mobile has developed fatal errors and is being discarded.
REPL definitions and persistent names/types will be lost.
error: expression failed to parse:
unknown error

This crash repeats whenever I calls a instance method of a swift class which is inherited from a base class in another framework.

Thanks.