Thanks, I ran the above command(s) from the SOLUS help center and rebooted the OS but the "error" still persists.
Well, as it seems not to have posed a problem until now I presume it will be OK if I just leave it at that.
Thanks anyway!
EDIT:
I deleted the package in question: It's only a duplicates checker and I don't really need it.
Now sudo eopkg check runs through and all packages are OK.
Feels great!
SOLUSfiddler