No submenu is shown and None menu is functioning....



RStudio build from source, git of September 20, 2018.
Everything goes on well. However, after installation, when I tried to run rstudio, I always obtain the following ERROR message:

$ [0920/] Failed to open file: /tmp/.gl2pTxbR (deleted)
  Error: No such file or directory

And, ONLY the 1st level of rstudio menu is able to show, none of the 2nd level menu is able to show. I mean, under File, there is NOTHING shown.

Suggestions please?



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