Lightroom 5 preview cache error

Hi,
I have a new problem with an old issue. I have read as many threads as I could on it and cannot seem to fix these issue.
I had been using LR4 and added new drives to my Mac Pro 2009 OS 10.6.8 w/48RAM
I started getting the the "LR encountered an error when reading the preview cache and needs to quit" message.
I have since installed OS Yosemite and installed LR5.2
I followed the instructions to delete the Previews.Irdata and then get this message
I have older catalogs from LR2,3 and 4 on another drive. Please don't laugh, I have no idea what to do.
There are .Irdata files in most of those folders too.
What do I do first?
I appreciate any suggestion and support.
Thanks RPT

Looks like a general Mac problem rather than particular to Lightroom. A Google search for that exact error message shows a bunch of possible solutions.

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