Just a thought; picking up one of your comments that you have D5 and D7 installed, I would suggest;
remove d7
remove d5
reinstall D5
install third-party components D5
service package D5
reinstall d7
install third-party D7 components
service package D7
then try again, performing the trick of deleting all .DCUs in your own project directories.
In my experience, I have always tried to set them βin the order of numbers,β and if you need to delete them, I usually delete them all before proceeding with the reinstallation.
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