There are many posts on this topic. The most likely reason you are getting this problem is you are trying to restore from a xxxxx.qdf file only, instead of the full set of files that comprise a backup set.
The historical prices are in a xxxxx.qph file, which appears to be missing.
You need to restore from a directory that contains up to 7 files, possibly including:
There may be others, depending on what you use QPP for.
These files may be stored in a single qdata.rkn, which is basically a qdata.zip file. (you could extract these files to a directory and try again)
Find out why you have only a qdata.qdf file in the restore directory.