***Visible cracks on render***

Hi…I wonder how to get rid of visible cracks on render wall( i used cell fracture)…thanx

Could be a couple things.
Overlapping faces?
Could be the edge of an image?
Too hard to tell without a blend file…

I try camera tracking and explosion together …i made wall and used real texture from movie but movie is little shake so border between wall and background(movie) is visible. Then i edit wall texture with alpha in border and set face texture alpha and z transparancy( image result in original post).
Simply i want border(edges) of wall transparent with background.
Here is blend file: http://ulozto.cz/x4upzvpc/exp-rar