Error in pca analysis in gromacs

GROMACS version:
GROMACS modification: Yes/No
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i am doing pca analysis of dna alone in which i get the error diagonalising segmentation fault core dumped by using the command-gmx trjconv -s md_0_300.gro -f md_0_300.xtc -o md_pca.pdb -e 1000
gmx covar -s md_0_300.gro -f md_0_300.xtc

By selecting the entire system, you’re building a massive matrix that is likely exhausting the memory available on your computer. There is also no reason to include water or ions in the analysis.