You have multiple 

    use xxxx

    make sure they don't have multiple paths back to MPI. For example if two of 
them have use petscsys etc

   Barry


> On Mar 7, 2018, at 10:11 AM, Praveen C <prav...@tifrbng.res.in> wrote:
> 
> 
> 
>> On 07-Mar-2018, at 9:34 PM, Smith, Barry F. <bsm...@mcs.anl.gov> wrote:
>> 
>>   Start with one use statement and slowly add more. My guess is multiple 
>> ones of those modules use the MPI module hence MPI_SUM appears through 
>> multiple paths.
>> 
>>   Barry
> 
> Hello Barry
> 
> If you mean use of “use mpi”, then I have dont have this anywhere in my code. 
> I only include petsc includes and modules.
> 
> Thanks
> praveen

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