ML_Star already defined in HSL

Hi, I’ve come across a new issue that I haven’t seen before.

When saving a new version of my method, eg V2. And then saving a new version of the layout and linking the two together. I get a ML_STAR already defined in HSL error. I can’t understand why this problem is occuring, it can even be that the layout and method are completely unmodified but the error arises when linking layout to method. I am working within the NGS framework in case that might make a difference?

Thanks for any help!