I’m having this implementation

@implementation XC
- (void) g
{
    NSString * appSpecificDirectory = [NSString stringWithString:@"x"];
}
@end

It gives this error in my project

error: no known class method for selector 'stringWithString:'
  120 |     NSString * appSpecificDirectory = [NSString stringWithString:@"x"];

However it works just fine if I use a random objective C compiler.

Any idea what are the possible causes?