A common error is to pass the object where the address of the object is needed. For example,
	MPI_Status status;
	...
	MPI_Recv( ..., status );
is incorrect; it must be
	MPI_Recv( ..., &status );
This is also true for buffers, and is a common error when passing single element buffers. For example,
	int value;
	...
	MPI_Send( value, 1, MPI_INT, ... );
is incorrect; it must be
	MPI_Send( &value, 1, MPI_INT, ... );