New users, the first web landing errors

Whenever a new user login to the Web version of owncloud, always prompts an error. The errors are as follows:

"
internal server error
The server sent an internal error and could not complete your request.
Please contact your server administrator. If you receive this error several times, please include the following technical details in your report.
More details can be found in the server log.

technical details
Remote address: 10.0.103.146
Request ID: M / wDk / uppN92wxkxPC3S

"

The second use of the user, once again through the Web landing, it returned to normal.

Prompted me to see the log file, yum install owncloud, log file location where? Ask this question, how to solve?

owncloud version:9.1

(I am Chinese) Simplified Chinese error:

内部服务器错误
服务器发送一个内部错误并且无法完成你的请求。
请联系服务器管理员,如果多次出现这个错误,请把下面的技术细节包含在您的报告里。
更多细节能在服务器日志中找到。

技术细节
远程地址: 10.0.103.146
请求 ID: M/wDk/uppN92wxkxPC3S

Which browser? And which specific ownCloud version? Newest 9.1.x?

Browser: Chrome and Mozilla

ownCloud version;ownCloud 9.1.1 (stable)

Would upgrade to the newest 9.1.3 first, there were a couple of fixes in the first login handling. Mostly for IE11, but might as well effect your case.