I have a build pipeline in Azure DevOps that I am attempting to build a front end React Typescript application with. This application uses Material ui and the issue seems to be with the code for that library. I have built this project before, but for some reason, now when I run the build, I am getting this error code:

'Box' cannot be used as a JSX component.
  Its element type 'ReactElement<any, any> | Component<BoxProps, any, any> | null' is not a valid JSX element.
    Type 'Component<BoxProps, any, any>' is not assignable to type 'Element | ElementClass | null'.
      Type 'Component<BoxProps, any, any>' is not assignable to type 'ElementClass'.
        The types returned by 'render()' are incompatible between these types.
          Type 'React.ReactNode' is not assignable to type 'import("/home/vsts/work/1/s/node_modules/@types/react-router/node_modules/@types/react/index").ReactNode'.
            Type '{}' is not assignable to type 'ReactNode'.  TS2786

    68 |     <React.Fragment>
    69 |       <div>
  > 70 |         <Box component="nav" className={classes.Nav}>
       |          ^
    71 |           <AppBar position="relative" className={classes.appBarStyles}>
    72 |             <Toolbar className={classes.toolbarStyles}>
    73 |               <div className={classes.toggleSlider}>

Here is the code for the navbar:

  return (
    <React.Fragment>
      <div>
        <Box component="nav" className={classes.Nav}>
          <AppBar position="relative" className={classes.appBarStyles}>
            <Toolbar className={classes.toolbarStyles}>
                .....
            </Toolbar>
          </AppBar>
        </Box>
      </div>
    </React.Fragment>
  );

I have upgraded the versions of materialui, react and react-dom, as well as typescript types; I have tried enclosing the Box element with a div and I have tried using the typescript ignore flag, but none of it seemed to have solved the issue.

I have been able to build this project before, so I am not so sure where the error is coming from. Any help is appreciated, thanks.