Current density monitor issue

Hello everyone,
I’m currently using SPIS 6.1.0 to model the plume emitted by an electric thruster and I would like to use the current density monitor but, no matter how I set it up, I always get the same error: “Cannot scale m-2.s-1 to m-2.s-1.ecu at spis.Util.Phys.Unit.getDoubleScalingFactorTo(Unit.java:447)”
“Current Density Monitor id27 instrument measurement failed because Cannot scale m-2.s-1 to m-2.s-1.ecu at spis.Util.Phys.Unit.getDoubleScalingFactorTo(Unit.java:447)”
I also changed the global parameters in the output tab but nothing seems to change.

Has anyone had the same issue? Any answer is much appreciated.
Regards,
Monica