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In the develop module, each time I hit "Previous" and/or Copy and Paste (Command C/V) I get this Internal Error. Lightroom 7.3.1 Mac 10.13.4
Consider how someone else might reproduce this error, which is the first step to fixing the issue.
In your other post you specify it only occurs with one particular camera, and the error message mentions something about camera profiles.
At a minimum, can you provide the camera model, the profile specified for the photo you are copying settings from, and the profile of the photo you're copying the settings to.