Toshiba DVD VCR Combo will not play DVDs now, only CDs will load

I have a two year old Toshiba SD-V393 VCR DVD combo unit that until today worked fine (but there was some skipping with the DVD player) I went on this site to find a possible cure for the occasional skipping issue and saw that the general consensus was to simply clean the lens. I put my lens cleaning disk in and let it do its job and now only music and picture CDs will play, All DVDs end up with the message incorrect disk type.

Does anyone know what the possible cause of this could be????