Error in entering user account in a protected PDF file

After entering my username and password for a protected PDF file, I found an error with Adobe Acrobat on JavaScript global security. I tried checking the "Enable global object security policy" checkbox but the error is still showing. What should I do?

Warning : JavaScript Window – Protectedpdf – Error
This document requires global security policy to be disabled.
Please go to Edit > Preferences > JavaScript and uncheck the “Enable global object security policy” checkbox.
Message code: 005
Please help. Thanks a lot.
