When backing up lightroom 4 catalog, get message "lightroom encountered an error when reading from its preview cache and needs to quit" this occurs during optimization stage of backup

i upgraded from lightroom 4 to lightroom 5 and installed it on a separate hard drive. Initially had no problems util my computer crashed due to the failure of the drive on which Lightroom 5 was installed. Since having my computer rectified, i am unable to use lightroom 5 getting the message "lightroom encountered an error when reading from its preview cache and needs to quit"
I can still use lightroom 4, however, i get the same message when i try to backup the catalog. This occurs during the optimisation phase of backup.
I suspect it is related to Lightroom 5 creating a catalog from the Lightroom 4 files and cannot now locate those files or that they have been corrupted.
Would appreciate any solutions / suggestions.

You need to delete your preview cache and have Lightroom rebuild it.   Cache location can be found here.
https://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroom-41.html
Why And How To Clear Your Lightroom Cache - Lightroom Fanatic

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