MCP must specify URI Scheme in Eclipse

I recently became interested in Minecraft modding, so I downloaded MCP (Minecraft Coder Pack) and Eclipse. After running decompile.bat, I opened Eclipse using the workspace provided by MCP. At first I was given a list of errors related to missing libraries, but I easily fixed that by fixing their paths. Then I continued following the video tutorial I was using and pressed "Run" and selected "Client" as the project to run. Eclipse gave me the following error:

Must specify a URI scheme:MCP_LOC/jars

I have been Googling this for the past 20 minutes with no success. What is wrong, and how do I fix it?开发者_开发问答

I can probably still program mods for Minecraft and even recompile them with MCP, but it will be difficult to test them. Does anyone know what's wrong?

NEVER START IN ECLIPSE

Try This vid for 1.7.3 Its a nice little series about minecraft modding.