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I received err99 using two different lenses with the same camera body. Is it the camera body?  The body is EOS Rebel XTi, the lenses are 85mm 1.8 and 17-55mm 2.8.  Can anyone help with information?

I have an 85mm f1.8 that causes my Rebel EOS Txi to give an error 99.  It will not take a picture, but will auto focus and I can change the f. stop.  I get about 10 shots before this error.  It suggests that I turn off and on the camera OR take out t...