I'm trying to deobfuscate some old mods so I can update them for personal use. I got MCP 7.1.9 for Minecraft 1.4.2 and downloaded the appropriate Minecraft jar. I copied the contents of the version folder to the MCP bin folder, two files named 1.4.2.jar and 1.4.2.json. I renamed them to minecraft.jar and minecraft.json.
I ran Bon, set the MCP folder, and got the following error when I tried to deobfuscate:
"An error has occurred - give immibis this stack trace (which has been copied to the clipboard)
java.io.FileNotFoundException: C:\Users\...\mcp719\bin\minecraft (The system cannot find the file specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)