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ERROR: No TRUELAT1 specified for Lambert conformal projection.

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I'm using mercator projection, however, when executing geogrid.exe, it shows this error "ERROR: No TRUELAT1 specified for Lambert conformal projection."

This error has nothing to do with my settings. Please advise, thanks!
I copied another namelist and modified it, then there is no such problem. However, I still cannot figure out why the previous error showed like that.
Have you compared the two namelist.wps you used? Is there any difference between the two? There must be a reason why the previous run complained of the truelat setting (I suppose you run with the same georgic.exe).
It is possibly because the specified value of truelat in the previous namelist.wps is integer, while the WPS program expects a real type. However, this still doesn't explain why the code complains of a variable that is not used based on the namelist setting.