Fully coupled flow deformation in Plaxis 2D

Hi,

I'm trying to perfom a fully coupled flow deformation analysis in Plaxis 2D considering infiltration to simulate rainfall data. 

The phase is after the initial one, when not considering the boundaries for the infiltration, the phase is calculated, but when I try to active the infiltration in the surface boundary I get this: Ultimate state not reached in groundwater flow analysis. [Error code: 34]

I have checked the inputs and the properties all seems to be good. It may be refers to the infiltration setting. 

Any help wil be appreciated.