For some reason, I cannot login anymore to my site. I do get the concrete upper screen followed by this remark:

Catchable fatal error: Argument 1 passed to ConfigStore::__construct() must be an instance of Database, null given, called in /home/**********/public_html/**/concrete/models/config.php on line 48 and defined in /home/**********/public_html/**/concrete/models/config.php on line 136


I never received this error is there some I can do to fix this?