Minecraft Modding Problem?

Minecraft Modding Problem?

Added (1). I can't load my project once saved. Example is I code, save in Eclipse, shut down, then when i want to go back, the project/package explorer is empty…

Depends on what device you are modding for like xbox, pc, ps4 etc. If its in a pc, backup your save files (Usually found in the documents folder in windows pc), keep the mod is a different folder somewhere else and then reinstall minecraft. After you install it back, put back all the backed up save files in the place it was in before. And then try installing the mod.