The parameter is incorrect?

[L i am]

Hi just opened a file and after about 5 mins when I triy to selecy anything a "the parameter is incorrect" as shown. I have purged and "fix problem" to no avail. Any clues guys I have never seen this before.

[Dave R]

Never seen that before. Is this in 2017 Make? Is it possible an extension is running that is having a problem? Easy way to check is to disable the extensions you have installed and try opening the model again.

[L i am]

Cheers Dave, will try your sugestion this afternoon, and will report back. However when you mentioned which version I was using I realised I had seen the message before. The model was created in 2018 or 2019 Pro (At work) and that messge had cropped up there as well. I cant remember how it resolved