Problem with BEAST

[Ki828 J]

Hi

I'm new to BEAST and I'm trying to do a Phylogeographic analysis. I am since a week I am trying do this analysis and I keep on getting this warning - 

Warning: removing transform class beast.base.inference.operator.kernel.Transform$LogConstrainedSumTransform because it should have at least 2 dimensions but it has 0

I am using BEAST v2.7.3

Model test I gave was HKY+G+I, strict clock model, coalescent constant population model.

Then I added a discrete trait to include location partition.

Any advices are appreciated,

Cheers, 

Nick