generate_events -f and interupted with error

generate_events -f
Generating 10000 events with run name run_01
survey run_01
INFO: compile directory
WARNING: information about "newcoup [10]" is missing using default value: 0.1.
Error detected in "generate_events -f"
write debug file /home/users/rs/subhasish/Research/MG5_aMC_v2_2_2/ee2zah/run_01_tag_1_debug.log
If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
MadGraph5Error : A compilation Error occurs when trying to compile /home/users/rs/subhasish/Research/MG5_aMC_v2_2_2/ee2zah/Source.
 The compilation fails with the following output message:
     make: Warning: File `../lib/libdsample.a' has modification time 24 s in the future
     gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -c -o setrun.o setrun.f
     cd PDF; make
     cd MODEL; make
     make[1]: Entering directory `/home/users/rs/subhasish/Research/MG5_aMC_v2_2_2/ee2zah/Source/PDF'
     make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
     make[1]: Warning: File `Ctq4Fn.o' has modification time 20 s in the future
     ar cru ../../lib/libpdf.a Ctq4Fn.o Ctq5Par.o Ctq5Pdf.o Partonx5.o Ctq6Pdf.o cteq3.o mrs98.o mrs98lo.o mrs98ht.o mrs99.o mrst2001.o mrst2002.o jeppe02.o pdfwrap.o opendata.o pdf.o PhotonFlux.o pdg2pdf.o NNPDFDriver.o
     make[1]: Entering directory `/home/users/rs/subhasish/Research/MG5_aMC_v2_2_2/ee2zah/Source/MODEL'
     make[1]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.
     make[1]: Warning: File `couplings.o' has modification time 20 s in the future
     gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -c -o rw_para.o rw_para.f
     ar cru ../lib/libgeneric.a alfas_functions.o transpole.o invarients.o hfill.o pawgraphs.o ran1.o rw_events.o rw_routines.o kin_functions.o open_file.o basecode.o setrun.o run_printout.o dgauss.o readgrid.o getissud.o
     gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -c -o model_functions.o model_functions.f
     model_functions.f:51.29:

           COT = 1.000000D+00/TAN(Z)
                                  1
     Error: 'x' argument of 'tan' intrinsic at (1) must be REAL
     make[1]: *** [model_functions.o] Error 1
     make[1]: Leaving directory `/home/users/rs/subhasish/Research/MG5_aMC_v2_2_2/ee2zah/Source/MODEL'
     make: *** [../lib/libmodel.a] Error 2
     make: *** Waiting for unfinished jobs....
     ranlib ../../lib/libpdf.a
     ranlib ../lib/libgeneric.a
     make[1]: warning: Clock skew detected. Your build may be incomplete.
     make[1]: Leaving directory `/home/users/rs/subhasish/Research/MG5_aMC_v2_2_2/ee2zah/Source/PDF'

 Please try to fix this compilations issue and retry.
 Help might be found at https://answers.launchpad.net/madgraph5.
 If you think that this is a bug, you can report this at https://bugs.launchpad.net/madgraph5
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