removed modul is making problem

I was using the DB Cache module from opencard market. It was creating problem,as it could not be disable from admin. It could be only forced uninstalled to be remove.
Now after some time suddenly my site is down showing
/library/pnsols/db_cache.php failed to open stream: No such file or directory

how can i remove such call from the system.
I am wondering that it suddenly showed up after weeks.
I need to get site up again from the serversite as i have no admin or any entrance to the site.
Please simple step by step explain....
my remrk to be carefully if someone consider to use this module. It works, but it is a rsic to remove. Also if you run it, admin is basically not respondng to any changes. Cache does not clean etc.
..
I need to clean system no PERFECTLY and Safe from any trace of it
site http://kwaize.com
thank for your support

You will probably be best to look at the DB cache module files then make sure you have removed all the files in the module from your shop files.
Then goto extensions/modifications and click the refresh button, clear your browser cache then all should be back to normal

i have no access to admin too. Can only check in the ftp
however which file might cause it, as it was already resisting the disable in the beginning.

Are there an hooks in opencart or kind of registry?

had no other choice than installing again and disable it. However still resistant to delete. The files are ignoring the delete command. It works well with all others...