Why it is impossible to parse BLEU score? Other metrics can be calculated correctly.

[liliyae]

/bin/sh: 1: /home/duyl/MuST-CoST/MuST-CoST-main/codegen_sources/model/src/evaluation/multi-bleu.perl: Permission denied
WARNING - 10/11/22 17:53:47 - 2:20:28 - Impossible to parse BLEU score! ""
INFO - 10/11/22 17:53:47 - 2:20:28 - BLEU /home/duyl/MuST-CoST/MuST-CoST-main/dumppath1/dobf_snippet_C++_C#/6s5v1lgdm4/hypotheses/hyp49.cpp_sa-csharp_sa.test_beam0.txt /home/duyl/MuST-CoST/MuST-CoST-main/dumppath1/dobf_snippet_C++_C#/6s5v1lgdm4/hypotheses/ref.cpp_sa-csharp_sa.test.txt : -1.000000