Dear @rick,
first of all, usually the .err and .log files usable error messages which points you to the solution.
Unfortunately, there are multiple issues in your input preventing the run.
For residual nuclei calculations you will need to enable additional processes. Mentioned in Note 4 of the manual page for the RESNUCLE card: see here
To enable them add the following cards to your input:
PHYSICS 1. COALESCE
PHYSICS 3. EVAPORAT
Since you have more than 150 MeV beam energy you need to use the executable linked with rQMD, called: flukadpm. You can find it the /bin folder of your FLUKA installation, and set it on the run tab in Flair.
Finally, you choose Rubidium as a material. Unfortunately, FLUKA doesn’t have the low-neutron cross-sections for it, and some other material. If you choose it by chance, just select another material. But, if you plan to simulate rubidium, that is a different question.
I hope this helps.
Cheers,
David