c++ - Getting error in cv::imshow() - ASSERT: "false" in file qasciikey.cpp, line 501 -

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i getting error whenever call cv::waitkey():

assert: "false" in file qasciikey.cpp, line 501

i not sure why getting error. running on ubuntu server 14.04 ec2 instance connected through mobaxterm on windows. if run of same code on normal ubuntu machine, works great.

this line happens:

char key = cvwaitkey(33);


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