LR can't process Nik Collection

When I try to get in to Nik collectin from LR

Lightroom OR Lightroom-Classic?

What Version NUMBER of Lightroom?

it says that LR can not process the marked file. It will not be opened.

Post a screen-clip of the exact error message.

I have worked with Nik Collection for 5 months now and this has never happend to me before.

So what do you think might have changed for it not to work?

What I can understand there is no problem from Nik Collection, I am upgraded and I have the right version of program, so the problem must be in <LR:

"upgraded" what?  Lightroom or Nik?

Is your NIK Collection the old 'free' Coogle version, or purchased from DXO?

What type of photo file are you sending to Nik program?

Is the photo marked as "missing" in the catalog?

What are your External  Editing settings for Nik program in the Preferences?

Which Nik program are you trying to 'Edit in'?