I found the cause. Since r28100, ParserLib-1.1's version upgrading function wasn't working.
Addons in files.wowace.com which have embedded ParserLib-1.1 revision between 28100 to 29434 will need to be touched to grab the fixed ParserLib-1.1 version.
Until all addons have updated ParserLib-1.1, using stand alone ParserLib-1.1 should prevent such problem.
Thank you very much, I'll try this today.