vim script can't create /tmp file

one of the script in my vim environment is not able
to create a /tmp file, i keep getting the following
error. This script is invoked every time i write
the file contents.

Error detected while processing function GenerateTags:
line 1:
E484: Can't open file /tmp/vEmReRC/36


Interestingly i am not seeing this error for the first
few writes after i open the file. the workaround is to
open/close the file, and i won't see the error for first
few writes, after that again i see the same error. any
clues for why it is happening and how to fix it.

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