Over head arrow

Hi,

It seems that \overrightarrow{} does not work and gives the error: “ParseError: KaTeX parse error: Expected ‘EOF’, got ‘\overrightarrow’ at position”

Is there a workaround this? I am trying to write vector notations by having an arrow above letters.

Thanks!

https://ww.wp.xz.cn/plugins/wp-katex/