Lightroom encountered an error when reading from its preview cache and needs to quit

Lightroom 5.3 quit and would not restart two weeks after the upgrade from LR4.  Imported six folders (30plus GB of pictures) sucessfully after the upgrade and all was well.  Then the error message.  Rebooted several times. No change.  Trashed the LR5 preferences suggested in another adobe forum disscussion about the same error.  Problem is when the previous folder was upgraded to LR5 standards after the preference trash, the six folders of pictures were not included in the upgrade (this is important: the folders were simply not included at all in the upgrade and do not appear in the folder window).  I went through the upgrade motions again and again the folders were not included. That means it's not possible to use the "find the missing folders" option in LR5.3.  The folders do not exist according to LR but they are in the same import location they were when all was working well.  Two questions:  The RAW images are still in the folders (and the backup) both in the same positions.  Can I somehow import from the backup or from the original folder from either of their original locations?  Or, do I need to trash the original folders and re-import all of the missing pictures into the upgraded ircat -- and not back them up again?  And finally, can anyone explain why the error in the first place?  Nothing changed from LR5.3  working perfectly this afternoon to not working at all this evening? Mysterious. Thanks.

One of the options i'm given when I try to launch LR4 is to upgrade the LR4 catalog so it's compatible with LR5.3.  Might that be the issue?  Before the error message and lockout I had imported the images with LR5.3 (which would be the LR4 -2 version of the previews, and LR4 -2 catalog after I made the LR4 to LR5.3 uggrade). But LR won't let me start from -2 catalog,  only from the -4 catalog which is the latest upgraded catalog version that doesn't include the folders full of the most recent imported images. Those folders should be there unless when I trashed the preferences and "upgraded again",  the original LR4 catalog, not the -2 LR5.3 version, was upgraded instead, which wouldn't include the six missing folders that were imported with LR5.3.  The LR4 -2 catalog is the key wouldn't you think?  Is there a way to launch that catalog?

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