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Psychopy Encountered an unhandled error message

I just installed the new version of psychopy and receive this error message:

wx._core.wxAssertionError: C++ assertion “(argtype & (wxFormatStringSpecifier::value)) == argtype” failed at C:\PROJECTS\bb2\dist-win64-py36\build\ext\wxWidgets\include\wx/strvararg.h(484) in wxArgNormalizer::wxArgNormalizer(): format specifier doesn’t match argument type

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File “ctypes/callbacks.c", line 234, in ‘calling callback function’
File "C:\Program Files\PsychoPy\lib\site-packages\pyglet\window\win32_init
.py”, line 661, in f
event_handler = event_handlers.get(msg, None)
SystemError: <built-in method get of dict object at 0x0000029421FA4FC0> returned a result with an error set