Ok, since you didn’t provide any details on how it crashed, i’m just going to give you the “fix all” solution. First, go into the technic folder. It’s called “techniclauncher” and is in the same folder as the .minecraft folder (i’m assuming you use a PC). Inside this folder, open the “tekkit” folder. Delete everything EXCEPT the “saves” folder (if you have worlds you want to keep), the texturepacks folder (if you have texturepacks), the servers.dat file, and, if you have waypoints, the “rei_minimap” folder (located in the “mods” folder). Reopen tekkit, and it’ll re-download everything. This should work, and if it doesn’t, then there is something wrong with your system, which could range from issues with Java to how much RAM its allocating. If you’re still crashing, go to the Technic Forums.
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