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The format of your PDB file is incorrect! Please check your PDB file.
Possible reasons are listed in the following:
    1.There are mutant residues in your file;
    2.The chain A (case sensitive) is not included in your PDB file;
    3.Your query structure has multiple chains;
    4.The chain is too short (< 30 residues) or too long (> 1000 residues);
    5.The upload protein structure is not in PDB format;
    6.Other unknown reasons.

Reference

Pei-Dong Zhang, Chun-Qiu Xia, and Hong-Bin Shen, QATEN: High-accuracy protein model quality assessment using attention graph neural networks.

Contact: hbshen@sjtu.edu.cn