Google Directions Json Error - objective-c

Question

I'm trying to get the directions using google directions but I'm getting this error :
Error Domain=org.brautaset.JSON.ErrorDomain Code=3 \"Unrecognised
leading character (41)\
Here is the Json
loadDirections('Avenida Paulista', 'Rua Augusta', { 'locale': 'en', travelMode: G_TRAVEL_MODE_WALKING, avoidHighways: false, getPolyline: true, getSteps: true, preserveViewport: false})
Whats is wrong? Whats Unrecognised leading character (41) mean?
- (void)loadWithStartPoint:(NSString *)startPoint endPoint:(NSMutableArray *)endPoints options:(UICGDirectionsOptions *)options {
for (int idx = 0; idx < [endPoints count];idx ++)
{
NSString* msg = [NSString stringWithFormat:#"loadDirections('%#', '%#', %#)", startPoint, [endPoints objectAtIndex:idx], [options JSONRepresentation]];
NSLog(#"msg %#",msg);
mstr = [msg retain];
[self performSelector:#selector(loadDirections:) withObject:nil afterDelay:0.5];
}
}
-(void)loadDirections:(NSString *)message
{
[googleMapsAPI stringByEvaluatingJavaScriptFromString:mstr];
}

Answer 1

The JSON is invalid.
{
'locale': 'en',
travelMode: "G_TRAVEL_MODE_WALKING",
avoidHighways: false,
getPolyline: true,
getSteps: true,
preserveViewport: false
}
I think this has something to do with G_TRAVEL_MODE_WALKING, it should be in quotes. The only valid JSON values are as follows
Objects ({})
Arrays ([])
Value
String ("this is a string")
Number 1/-1
true
false
null
JSON Documentation

Answer 2

Make sure that, while initializing the GDirections object, you also pass an actual element as the second parameter.
As stated in the documentation:
The mode of travel, such as driving (default) or walking. Note that if
you specify walking directions, you will need to specify a panel
to hold a warning notice to users.
If you are using the Map-Kit-Route-Directions extensions, you just have to open the api.html file and, at line 16, substitute this
gdir = new GDirections(null, null);
with this
gdir = new GDirections(null, "body");