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I had a mod(http://www.planetminecraft.com/mod/burning-war-mod-forge/) that I made, and was crashing the server, but not the client. The crash report seemed to point to the cause being related to ModLoader.class, possibly missuse of it.

crash report:

 

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I tried re-wording the code in my main mod class file, but nothing seemed to work. So I tried the same thing with a popular mod that uses ModLoader.class (http://www.planetminecraft.com/mod/146gem-mod-new-armor-new-tools-new-food-new-blocks/), and got a similar crash report, this time when apparently using ModLoader.class to add acheivments.

crash report:

 

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I used the most recent version of forge to write my mod, to test my mod before compiling, to run the server, and to run the client. The other mod did cause the client to crash, but did not output any file to tell me why.

Posted

There are mods out there that are written for ModLoader specifically, these mods usually do not work when you put them on the server as ModLoader does not work on the server, and a modder has to take special care not to invoke any client specific code on the server.

Seems that the mods you've mentioned have not taken that care and are not dedi server compatible.

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
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