I’m attempting to estimate a in RStan on simulated data. The program is several hundred lines, so I’m not including it for brevity. I’m able to obtain posterior draws from 10 parallel chains (500 warmup iterations, 1000 total iterations) whenever I set the number of simulated observations to 1,000. However, when I increase the number of simulated observations to 10,000, I receive the following error:
Error in FUN(X[[i]], ...) : trying to get slot "mode" from an object of a basic class ("NULL") with no slots Calls: stan ... sampling -> sampling -> .local -> sapply -> lapply -> FUN Execution halted
The error is triggered after 6 chains complete. However, the other 4 chains appear to never start. Any idea why changing the sample size would trigger this behavior?