[Koha] Koha Master Password

[Ashok Francis]

Dear All,

I was using koha 17.05. When I changed koha's master password by following
this blog link http://kohageek.blogspot.com/2013/05/how-to-change-master-password-of-koha.html,

<http://kohageek.blogspot.com/2013/05/how-to-change-master-password-of-koha.html>
I am getting the following error.

Then, I tried to update and upgrade to the new version of koha 18.05. Even
then, I am getting the same error.

Software error:

DBIx::Class::Storage::DBI::catch {...} (): DBI Connection failed:
ccess denied for user 'koha_library'@'localhost' (using password: YES)
at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1398. at
/usr/share/koha/lib/Koha/Database.pm line 100

For help, please send mail to the webmaster ([no address given]), giving
this error message and the time and date of the error.
Please help me to solve this problem. I really appreciate your help.

Thank you,

Ashok.