Errors are occured in PCA analysis

I ran PCA analysis five times but got the same error. I am using the trajectory.dcd file after completion of MD Simulations of protein_ligand complex and the strcuture file (pdb) is protein(1vr2) file downloaded from Protein Data Bank. Please can anyone solve this problem and help me get PCA results?

Consolidating into one topic Errors occured in PCA analysis