Unable to apply rules

[kepo]

Hello,

When I try to apply catalog price rules I get the warning:
Unable to apply rules. Invalid website code requested: Array

What can I do to solve this problem?

Thanks in advance!

[Mukesh Tiwari]

@kepo Are you able to see any errors in Magento System.log or in Exception.log file. If yes Please copy paste in the question.

[kepo]

@Mukesh Tiwari This is in the system.log:

2015-09-07T07:21:21+00:00 ERR (3): Notice: Array to string conversion  in ...l\lib\Varien\Db\Adapter\Pdo\Mysql.php on line 3074

[Mukesh Tiwari]

@kepo Have you done any recent coding changes in your Magento installation?

[kepo]

@Mukesh Tiwari only some updates, but not manual