The Show() solution of class TCanvas did not work

in my projection, the Show() solution of class TCanvas was used to show canvas,
but it did not work, what is the probable reason?
ROOT Version: 6.28/04
Platform: Ubuntu 20.04
Compiler: GCC 9.4.0

We need a bit more information to answer your question. Can you send a small script reproducing the problem?

@couet , thanks for your reply, the problem has been solved throught add class TApplication.

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