Hi, I've installed this rom and gapps coming from Eco CM7.
How could you install gapps for CM7?? Install gapps only from here (page 1). Format everything and install again.
But first check your system partition in Settings - Partition info, it must be ###/160.
I think he meant he installed this ROM and Gapps from this thread having come from CM7, not that he installed this ROM with the Gapps from CM7.
Anyhow checking partition sizes is a shout, other than that maybe try redownloading the .zips from this thread, could be a bad download?