I'm getting Compile time dependencies of BiomesOPlenty [api] could not be resolved. (Could not GET 'http://files.minecraftforge.net/forgeBin/forgeBin-dev-1.7.10-10.13.4.1614-1.7.10.xml'. Received status code 500 from server: Internal Server Error) types errors from NetBeans when trying to load the 1.7.10 branch and was hoping someone would be kind enough to help me smooth out the kinks so I could finish what Reika started with #567.

I've downloaded the forge source for the 1614 build from http://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.7.10.html, opened the terminal within the unzipped directory, and successfully run gradlew.bat setupDecompWorkspac but that's apparently not enough.

Some kind of guide (or a link to an existing guide) for setting up a dev environment for working on an existing mod (like BoP) would be great.

running gradlew.bat --refresh-dependencies in the BoP directory may have resolved my issue.

Closing this as it sounds like you've resolved it