The threading program Env-PPAS doesn't work correctly (same problem for I-TASSER5.0 and 5.1)

Dear I-TASSER developers,
I am using the standalone I-TASSER5.1 to do modeling of some proteins. However, an error occurred during the running of example protein. A threading program 'Env-PPAS' seems not to work as expected. The error log file 'err_Env-PPAS_example' reported that 'At line 697 of file zal3.f\nFortran runtime error: No such file or directory\n'. The following is what I used as the parameters:

Your setting for running I-TASSER is:

-pkgdir = /path/to/itasser/I-TASSER/I-TASSER5.1
-libdir = /path/to/itasser/I-TASSER/I-TASSER5.1/ITLIB
-java_home = /path/to/java/jdk1.8.0_181
-seqname = example
-datadir = /path/to/itasser/I-TASSER/I-TASSER5.1/example
-outdir = /path/to/itasser/I-TASSER/I-TASSER5.1/example
-runstyle = parallel
-homoflag = real
-idcut = 1
-ntemp = 20
-nmodel = 5
-light = false
-hours = 50
-LBS = false
-EC = false
-GO = false

Additionally, I checked the template script 'Env-PPASmod' under the directory of I-TASSERmod. It seems that no parameters are explicitly specified for zal3 program, so we don't know exactly what files are missing for running this program.

Looking forward to hearing from you. Thank you a lot!

Regards,