Fusion CMS Error

[Thenatural13]

Hey guys.Was trying to install fusion cms on host,and got this error.

CMS database connection failed:
config(); break; case "database": $this->database(); break; case "realms": $this->realms(); break; case "ranks": $this->ranks(); break; case "folder": $this->check(); break; case "checkPhpExtensions": $this->checkPhpExtensions(); break; case "checkApacheModules": $this->checkApacheModules(); break; case "checkPhpVersion": $this->checkPhpVersion(); break; case "checkDbConnection": $this->checkDbConnection(); break; case "final": $this->finalStep(); break; case "getEmulators": $this->getEmulators(); break; } } } private function getEmulators() { require_once("../application/config/emulator_names.php")

Hosted on linux debian.
Could someone please help me?
thanks