The Modpack Location you specified is not a valid ZIP file.

[wartail]

Hello I am actually trying to make a mods pack for my server but its still writing to me that The Modpack Location you specified is not a valid ZIP file. And I don't really know how to make a modpack. Help me

[TerdyTheTerd]

Have you followed any guides? I would start there, no need to re-type a whole guide, if there is something in specific you are stuck on ask away, otherwise search for some guides and follow them. 

The only comment I would make is if you are going to use 1.12.2, most guides will instruct you to use the universal file, however if you use the latest version (2854) then you have to use the installer.