[petsc-users] What caused this problem."PetscInitialize() must be called before PetscFinalize()"

[丁老师]

Dear friends:
   My code run without any problem yesterday, but it gives me the following 
error. I do not know what is the reason?
Regards

[0]PETSC ERROR: #1 PetscOptionsInsertFile() line 563 in 
/home/ztdep/Downloads/petsc-3.6.3/src/sys/objects/options.c
[0]PETSC ERROR: #2 PetscOptionsInsert() line 720 in 
/home/ztdep/Downloads/petsc-3.6.3/src/sys/objects/options.c
[0]PETSC ERROR: #3 PetscInitialize() line 828 in 
/home/ztdep/Downloads/petsc-3.6.3/src/sys/objects/pinit.c


PetscInitialize() must be called before PetscFinalize()


Regards