MIKE SHE error in GW elevation

I am trying to run a simulation of a green roof using the UZ, SZ and overland flow modules and the saturated zone drainage option for routing water from the model (to simulate the effect of the roof drains). The preprocessing succeeds, but whenever I try to run the WM analysis, it shuts down after about 30% simulation after giving the following error:

"Error: groundwater below bottom of UZ column at point
depth to groundwater: 0.29 (level=-0.29)
max depth of column: 0.28 (soil profile 1) "

What could be causing this problem? I have tried altering the hydraulic conductivity and column heights of the soil profile in the UZ but am still getting either errors or results which are clearly inaccurate.

Thanks!

Hello,
the soil column of you UZ-zone must be embedding into your SZ. Try to extend the soil profile of your UZ.
Greetings
Patrick

I have solved this issue before by increasing the depth of the UZ layer. In our models in Florida, USA, this depth goes 30 meter below the ground in order to avoid this error message. I imagine that in other areas with steep topography you may need to go deeper.

I hope this helps.