Gaussian Process Error - Model won't run

[#1]

I have two very similar datasets with environmental parameters and abundance. I'm using Gaussian Process to evaluate how the environmental parameters influence abundance. On one dataset, the model runs fine and I get good results. When I try with the other, I get an error message saying "Unable to estimate Gaussian Process model. No valid starting values found". I can't find anywhere online what the specifications for the model is or what I might be doing wrong. The only real difference between the two is sample size - the one that works has close to 400 observations and the one that doesn't has around 100. Any ideas?

[#2]

Welcome to the community.  Could you post the data tables?  Does Fit Model work?  Are the data types the same in both data tables?

[#3]

Are you estimating the Nugget? This can help when the data are not deterministic. Did you deselect the Fast GASP option? This feature is intended for very large data sets unlike your cases.