I am trying to call an existent function from a remote site in a WKWebview:

function addtext (text) {

 jQuery(#webviewtest).html(text);

}

With:

[self.WebView evaluateJavaScript:@addtext(This is a text from app); completionHandler:^(id Result, NSError * error) {

    NSLog(@Error -> %@, error);

}];

But this is throwing an error:

Error Domain=WKErrorDomain Code=4 A JavaScript exception occurred UserInfo=0x170c788c0 {NSLocalizedDescription=A JavaScript exception occurred}

This is so simple! I am must missing something really stupid!