Error 40 at Mettler DL70 ES Titrator

Hi. I am working on with old titrator from Mettler, DL70 ES. I have created a method with EDTA titrant using mettler template. However, I cannot incorporate the method to run in the machine.

There was an error sign popped up, E40: There are other method list in addition to that just run.

The titrator tab also showed IDLE.

Please give advice on what should I do.

BR,

Maureen