MCP 9.10 does not include the latest MCPBot mappings, since developing mods without these updated mappings is a massive nuisance LiteLoader is built using a recent snapshot of the MCP mappings.
The latest MCPTEST mappings can always be retrieved from http://mcpbot.bspk.rs/testcsv/
To get the updated mappings, perform these steps before decompiling minecraft for the first time. If you have already decompiled minecraft, run the MPC cleanup task first to remove the invalid sources, or simply delete the temp and src directories from your MCP installation.
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Using a text editor, open /mcp910/conf/mcp.cfg
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Locate the setting UpdateUrl and change the domain to dl.liteloader.com as shown
UpdateUrl = http://dl.liteloader.com/files/mcprolling_{version}/
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Save the file and run the updatemcp script, it should prompt you to download 3 files.
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Type yes to accept the download.
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Run decompile as normal.