What Does "cannot read item cafebabe-cafe-babe-cafe-babecafebabe" Error mean While uploading package

Above Error mean that You are not logged in as Admin user before uploading the package.

Regarding package share, you could also get the error "Item cannot be saved because it has been modified externally"

If you are getting this error in CQ5.3/CRX2.0 -- Solution would be to go to CRX Explorer and then click on revert all on the top. Or navigate to uploaded package under /etc/packages and then remove that package.
A good solution would be to upgrade to CRX2.1/CRX2.2

If you are getting this error in CRX2.1 -- As a workaround, you can touch this package again by going to package share -> Then select that package and then click on rewrap. Also, you can try to use the CQ package manager instead if nothing works.

The reason why you get this error because the CQ package manager interferes with the CRX package manager (Disabling any one of them will resolve this issue permanently ) when you install a package. I have not this issue in CRX2.2.