I upgraded to V1.6-b1. Error didn't occur in local host. However, below error occurred in another server.
Error 1005: Can't create table './*/qa_userlevels.frm' (errno: 150)
"foreign_key_checks" isn't defined with another server. Because "foreign_key_checks" is default 1, I thought that below measures are necessary.
http://stackoverflow.com/questions/4268801/ignore-mysql-foreign-key-constraints-in-php
Answer is here (by edward).
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.