While I was using the WPI 8.6.3 with no problems, this error suddenly came out when I run WPI: I upgraded to WPI 8.7.2 and after fixing some lang file errors and config.js errors, the same error mentioned above came out again! The above same window appeared again after pressing Yes, and WPI seemed running well after pressed Yes the second time. If I pressed No, the above window only appeared once and WPI seemed running well afterwards. Windows 7, IE11, os lang:en_us, system locale : chinese taiwan It seemed this error came after I ran the same WPI in another user account of the same OS, ????