how to resolve the error Symbol ‘vecsize_memmax’ at (1) has no IMPLICIT type

I have generated a process through my model file and am trying to calculate the cross section of the process but i am getting the error str : A compilation Error occurs when trying to compile /home/vartika/madgraph/MG5_aMC_v3_5_6/MyProcess!/SubProcesses/P1_uux_af.
 The compilation fails with the following output message:
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c unwgt.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c cuts.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c reweight.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c initcluster.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c addmothers.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c setscales.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c dummy_fct.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c auto_dsig.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c auto_dsig1.f -I../../Source/ -I../../Source/PDF/gammaUPC
     gfortran -w -fPIC -O -ffixed-line-length-132 -w -c matrix1_orig.f -I../../Source/ -I../../Source/PDF/gammaUPC
     run.inc:53:45:

        53 | DOUBLE PRECISION s_scale(VECSIZE_MEMMAX)
           | 1
     Error: Symbol ‘vecsize_memmax’ at (1) has no IMPLICIT type
     make: *** [makefile:80: cuts.o] Error 1
     make: *** Waiting for unfinished jobs....