The specifier “%S” was a bare specifier, but was not remapped to anything. Relative module specifiers must start with “./”, “../” or “/”.
Roedd y manylebwr “%S” yn fanyleb plaen, ond ni chafodd ei ail-fapio i unrhyw beth. Rhaid i fanylebwyr modylau cymharol ddechrau gyda “./”, “../” neu “/”.