-24969: ERR_XPDIRTY - param file is dirty 

Explanation:

An attempt has been made to make a change to the database parameters without first checking whether or not a previous change works properly by restarting the database instance.

User Action:

Start the database instance and repeat the change you made to the database parameter.

Restarting the database instance breaks the connection to all users logged on to the database instance or ends all programs that are running on it.