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I can add to the kind Japanese person who filed this bug.
This bug is observed for Java as well.

(1) In Line 62 of Symbols.java file, the argument
to "lastIndexOf" is a string literal. It should be a character
literal i.e., '\\' (not "\\").

(2) Even with the fix above, the code basically assumes that
the Param file is going to have a path with back-slashes.
This will not be the case if the user has the "ssl"
or "shellslash" option set. The fix is quite easy. If the above
call to lastIndexOf returns -1, check for '/'.

Finally, accept my kudos for a great job done on the plugin.