Why is measurefit in VMD showing following error "measure fit: selections must have the same number of atoms" ?

09 September 2015 0 9K Report

I tried to align molecules basically proteins at different frames to understand the ligand interaction. But to my dismay it shows an error "measure fit: selections must have the same number of atoms". then i checked in TK console and found that atom numbers are indeed different and are increasing one per each frame i choose. how can i make the atom numbers same?

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