FOSS gamedev and creative worlds

please help, when i put a mod and when i start the game and click my world it gives a error

Make sure the mod-fouler has the name of the mod. Sometimes its "autorname-modname-versionnumber", reduce that to "modname". Or post the error message.

For example, PilzAdam's wireworld mod comes in a folder named 'PilzAdam-wireworld-b97219d'. Rename it to the bit in the middle 'wireworld', and it works.