Hi
I am trying to run an RBA across 24 ROIs but am getting an error: The model does not contain posterior samples.
I have updated my brms package in R and tried a simplified model with just an intercept, but no luck

Command here:
RBA -prefix outrba \
-Subj subject -ROI region -Y Y \
-chains 1 -iterations 1000 \
-model '1+Dx+Sex+ageZ+IQZ' \
-cVars 'Sex,Dx' -qVars 'ageZ,IQZ' \
-EOI 'Dx' \
-dataTable rba_data.txt

full error:
updating R_LD_LIBRARY_PATH ...
Loading required package: Rcpp
Loading 'brms' package (version 2.15.0). Useful instructions
can be found by typing help('brms'). A more detailed introduction
to the package is available through vignette('brms_overview').

Attaching package: ‘brms’

The following object is masked from ‘package:stats’:

ar

Compiling Stan program...
Start sampling

SAMPLING FOR MODEL '195dfc87925c7f2ea0eb9ee45da11f35' NOW (CHAIN 1).
Chain 1:
Chain 1: Gradient evaluation took 0.000511 seconds
Chain 1: 1000 transitions using 10 leapfrog steps per transition would take 5.11 seconds.
Chain 1: Adjust your expectations accordingly!
Chain 1:
Chain 1:
Chain 1: Iteration: 1 / 1000 [ 0%] (Warmup)
[1] "Error in sampler$call_sampler(args_list[[i]]) : "
[2] " c++ exception (unknown reason)"
error occurred during calling the sampler; sampling not done
[1] "05/13/21 20:57:01.497"
user system elapsed
31.633 1.793 34.891

++++++++++++++++++++++++++++++++++++++++++++++++++++
***** Summary information of model information *****
Family: gaussian
Links: mu = identity; sigma = identity
Formula: Y ~ 1 + Dx + Sex + ageZ + IQZ + (1 | Subj) + (1 + Dx + Sex + ageZ + IQZ | ROI)
Data: lop$dataTable (Number of observations: 1296)

The model does not contain posterior samples.

***** End of model information *****
++++++++++++++++++++++++++++++++++++++++++++++++++++

Error: The model does not contain posterior samples.
Execution halted