Hi @Sabrin,
This is a different error message, which in some ways is good news (i.e. we've sorted out the original problem)!
So for this error:
Error: Estimation failed for the following covariates:
EnvironmentGut, EnvironmentSeagrass, EnvironmentSeawater, EnvironmentSediment
Please ensure that these covariates do not have missing values and check for multicollinearity before re-estimating the model
It looks like a couple of things could be happening.
Either there are missing values associated with the covariates listed above (i.e. the Gut, Seagrass, Seawater and Sediment groups under the Environment column), or there are covariates in this list that are multicollinear (i.e. your independent variables are actually correlated).
If your problem ends up being the latter, this can be a bit trickier to resolve; you may find this related thread to be helpful in figuring out how you'll want to adjust your model to deal with this.
Hope this helps! Cheers 