Invalid version specification

I have a large shiny app, with integrated python scripts and rmarkdown reports which recently has been failing to launch as following:
'''

runApp()
Warning in if (grepl("\.$", v)) v <- paste0(v, "9000") :
the condition has length > 1 and only the first element will be used
Error: invalid version specification ‘'.' is not recognized as an internal or external command,’, ‘. program or batch file.’

'''
I want some suggestion regarding the approach for solving it.

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