idb2pat in ida6.8 with "NoneType" error

[m0ck1ng]

I was using an earlier commit(Jan. 2016) of idb2pat.py in IDA 6.8. However I came across an error as following:

"idb2pat.py:'NoneType' object has no attribute 'rfind'
Traceback(most recent call last)
File D IDA 6.8\python idaapi py line 601, in IDAPython ExecScript execfile (script, g)
File D: /IDA 6.8/plugins/idb2pat py line 478, in <module> 
main()
File D: /DA 6.8/plugins/idb2pat py, line 449, in main 
update config(c)
File D: /Da 6.8/plugins/idb2pat py, line 426, in update config 
name, extension =oS path.splitext(get input file path())
File "C: \Python2/(Lib\ntpath py line 190, in spliter return genericpath. splitext(p, sep, altsep, extsep)
File C:\Python2/Lib\genericpath py", line 91, in splitext
seplndex= p.find(sep)
AttributeError: None Type object has no attribute find"

I put idb2pat under ./plugin. Is it correct?