You're not supplying them with what they need... kind of obvious...

Check the guides, some of them talk about the production process (e.g. sugar --> rum; logs --> planks --> boats).

Buildings lacking inputs can be a sign of either a production issue or a transportation issue. Try to diagnose the cause before you attempt to fix the problem, as producing more inputs is unlikely to help when the problem is a transportation issue and building more Teamsters' Offices is unlikely to help if the issue is inadequate production of raw materials. Also be aware that shortfalls in the production of raw materials can sometimes be the result of transportation issues, for example when using Manure Spreaders to counteract the soil degradation caused by Monoculture Plantations.

I will add that building more Teamsters' Offices is not necessarily the best solution to transportation issues, especially if your transportation issue is traffic-related.

I dont know if this is a trick i do but i try make supply lines as short as possible sometimes so my guys who drive the trucks and bring supply around dont waste to much time up and down. How ever you should always be sure to have enough of them + the production companys need a good output collection. You can tweak output speed of supply by increasing wage or upgrading a build. Also Teamster docks for island can be handy if used differently i sometimes add landings docks to let people use the water ways to go up and down. its cheaper then build bus stations also i like use metro stations more once i get to it.
-- one of my tricks if i do find coal and iron together i tend make a steel production there and make everything near each ather includding future production cars / weapons -- there also serten things you can do its the freeway policy to increase speed on the road -- 1 small fix to Teamsters is the upgrade to more people. But yes make check the problem and try to see what is going on in you're save game and if the roads connect whole island nicely -- sometimes it can help to make extra tunnel or metro or even a exporting dock to move things around

Thanks Guys. I have loads of teamsters so i don't think that is the issue. Tobacco Plantation is next door to the Cigar Factory. My Manure Spreaders are ok now, it's started happening with my Rum Distillery Now which is next to my Sugar Plantations. I do try changing things but nothing happens. Having similar issues with my Tannery since this morning. That was ok.
My City is quite small so don't think it's Traffic either.

Originally posted by Lord Odin:

Thanks Guys. I have loads of teamsters so i don't think that is the issue. Tobacco Plantation is next door to the Cigar Factory. My Manure Spreaders are ok now, it's started happening with my Rum Distillery Now which is next to my Sugar Plantations. I do try changing things but nothing happens. Having similar issues with my Tannery since this morning. That was ok.
My City is quite small so don't think it's Traffic either.

Ive always noticed something with RUM or STEEL production plants or they produce to little because to low input and need massive sallary and upgrades and stil not process fast enough or they get the clogging symptons its alway 1 or the ather. Also at serten stages of my tropico island i tend to put the steelmill on Hot Rolling to produce more Steel but the demand is always higher then the production i can run with 1 STEEL production plant. But if i try go 2 most of the time it makes like traffic jam problemen its same for RUM production. I think in general there might be something wrong with these 2 buildings. but im no game dev. Also Hot rolling in the STEEL PLANT barely shows a big enough improvement its litteraly just a bit more. --- p.s you got several production or only 1? --- also they way i run them they always have way to much output but i most consume my own steel faster. --- I wish we had ways to make a trainyard to the docks to put cargo there quicker. Teamsters are nice and all but at a serten point the eum well kinda run out of juice to keep the nation going. So El presidente need to motivate them with violence (smokes big sigar)