I have also faced this issue in the past. The people who are beginners for phpmyadmin they often face this error. I can help you in fixing this error.
I had just started to use my repository so I used following command "
chmod 777 -R"'on my complete /opt/lampp directory just to make sure that the permissions should not be an issue for the pushing of my repository. Then I had faced two errors but I guess I was able to see only one of them and the other one came up after fixing my first one.
The first error was ./lampp/etc/my.cnf the chmod 700 on my file fixed it in my case still 755 was the better choice that I found out in my research.
The file which is behind causing a specific error message in this question was ./lampp/phpmyadmin/config.inc.php.
And the solution to error is below command:
$ chmod 755 -R /opt/lampp/phpmyadmin"