In my case, the metadata Language: French translated to \def\language{french} causes issues. A variable with the same name is probably defined in the babel or some related package.
I must say that I'm not using the plain mmd header file, so the error might be caused by the specific packages in my preambule, but there is nothing really fancy there. Only the recommended packages for writing in French.
Maybe a more smartypants-specific metadata name would be appropriate.
In my case, the metadata
Language: French
translated to\def\language{french}
causes issues. A variable with the same name is probably defined in the babel or some related package.I must say that I'm not using the plain mmd header file, so the error might be caused by the specific packages in my preambule, but there is nothing really fancy there. Only the recommended packages for writing in French.
Maybe a more smartypants-specific metadata name would be appropriate.