Here, my code was in a datafile= option, but it could just have easily been an INFILE or a FILE statement or a FILE= option.
For example, when I refer to a C: drive location in SAS University Edition, I can generate the same kind of '/opt/sasinside' error, as shown below:
All you have to do is get some part of the path incorrect, or refer to a drive location instead of /folders/myfolders/ or not define your shared folder location correctly. Just to clarify the ERROR that shows '/opt/sasinside' is very easy to generate in SAS University Edition.