A 4.x user encountered this error in their Run logs (a job)
2022-01-06 03:08:05 : Installing R package from /mnt/ehexl/ProjExporting
2022-01-06 03:08:06 : Warning: invalid package '/mnt/ehexl/ProjExporting'
2022-01-06 03:08:06 : Error: ERROR: no packages specified
This error will occur if your project imports a project which been set to export Code Package = R, but doesn't actually define an R Package (for more information on defining an R Package within Domino Data Lab see Article: Exporting Files As A Python Or R Package).
To resolve the error while still being able to reference files from the imported project leave "Files" checked, but set "Code Package" to None: