strange compiler (linker) error

[Lloyd Dupont]

I have DMD2.053, on Windows.
I just moved my folder around.

I compile with the following command line:
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dmd -lib -g -unittest -debug -w -wi -X -Xf"Debug\dinstall.json" -of"Debug\dinstall.lib" 
 -deps="Debug\dinstall.dep" -map "Debug\dinstall.map" -L/NOMAP 
@Debug\dinstall.build.rsp
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I got the following error, what the heck that could mean?
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Error: multiple definition of format_b8_a15: _D10format.18412__ModuleInfoZ 
and format: _D10format.18412__ModuleInfoZ
Building Debug\dinstall.lib failed!
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