Pardiso error

Hi,

I am using Pardiso, from the MKL that ships with icpc 16.0.0 on Mac OSX.

I have already computed a LU factorization, and I want to use Pardiso as an iterative solver using the previous LU factorization as a preconditionner. For that, I've set iparm[3] = 21 for 2 digits of accuracy. But pardiso_64 returns an error -4 and iparm[19] contains -18.

I don't understand what's going on as the last digit of iparm[19] should be either 1, 2, 3, 4 or 5 according to the MKL documentation : https://software.intel.com/en-us/node/521691