Fixes missing tracebacks for exceptions during class imports
Fixes missing tracebacks for exceptions during class imports

NinjaMSP/crossbar,w1z2g3/crossbar,NinjaMSP/crossbar,w1z2g3/crossbar,NinjaMSP/crossbar,w1z2g3/crossbar,w1z2g3/crossbar,w1z2g3/crossbar,w1z2g3/crossbar,w1z2g3/crossbar