The second problem occurs in conjunction with Artisanal Reskins:  Bob's Mods.  I got two error messages this time, oddly.  -~-
The first message is with all mods disabled except for AR:  Bob's Mods, AR:  Library, Factorio Library, Bob's Functions Library mod, Bob's Mining, and P.U.M.P.S:
Failed to load mods: P-U-M-P-S/utils/lib.lua: 111:  attempt to index global 'inputs' (a nil value)
stack traceback:
P-U-M-P-S/utils/lib.lua: 111: in function 'assign-icon-tier'
P-U-M-P-S/data-updates.lua: 60: in main chunk
With all mods installed except for RitnGlass and RitnLib, the message is this:
Failed to load mods: P-U-M-P-S/utils/lib.lua: 103:  attempt to index field '?' (a nil value)
stack traceback:
P-U-M-P-S/utils/lib.lua: 103: in function 'assign-icon-tier'
P-U-M-P-S/data-updates.lua: 60: in main chunk
I've got an extensive list of mods installed, so I would basically expect something like that to happen, when trying to run them all at once.  Having a problem with just Artisanal Reskins enabled, though... that's got me confused.
Have you any idea why this would happen?  I can post a full list of my modset if it will help you.  It's quite a long list, though.
Please let me know if you require this.  Thanks again for your mod.  I really like Flow Control for Bob's Logistics too... :)