Project Build Error PRJ0044
The 'Additional Dependencies' property for custom build rule 'rule' assigned to file 'file' is invalid. The property contained 'string' which evaluates to 'value'.
The Additional Dependencies property evaluated to an empty string, or to a string that contained invalid characters (any character that could not be in a file or directory name). Custom build rules need the output of the build action.
For more information, see Specifying Custom Build Tools.