not able to open a pic from literoom to photoshop

When the 'link' between Lightroom Classic and Photoshop has issues, one of the first things to try is this:
1. Use the Adobe Creative Cloud application to uninstall both Photoshop and Lightroom Classic and when asked, keep preferences. 
2. Install Photoshop first, then Lightroom Classic. 
Better? 

<moved from using the community>

Just to be clear, you're trying to open a photograph in Photoshop, and it's a photograph you'd done something to in Lightroom? Once we know, someone will be along to move this post to the proper forum.

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