Currently NLME has the limitation of 1000 data rows per ID. If this limit is exceeded the user will get a non-descriptive error like “There was an error while executing Workflow X, Model execution failed or cancelled”. The current limitation on total observations is 120,000 A Workaround for this situation is: a) Add a new id column to the data set and add a separate ID value to each successive block. Of 1000 observations – i.e. treat the data as if it came from 17 individuals with 1000 observations each b) Run the Naïve pooled engine – the results will be the same as running a single individual with 17000 observations In the future (after PHX 1.3) NLME will resolve this problem by implementing dynamic memory allocation.