Problems with passing of data from NSDictionary to NSMutableDictionary
<p>I'm trying to access a webservice using the json framework. </p>

<p>Code:</p>

<pre><code>NSDictionary *allData;
NSMutableDictionary *displayData;
NSString *string = [[NSString alloc] initWithFormat:@"http://localhost/Gangbucks.svc/GetDealList"]; 
NSURL *jsonURL = [NSURL URLWithString:string];  
NSString *jsonData = [[NSString alloc] initWithContentsOfURL:jsonURL];  
self.allData = [jsonData JSONValue];  
NSLog(@"allData  value is1:%@", self.allData);      
self.displayData = [[NSMutableDictionary alloc] initWithDictionary:self.allData];
NSLog(@"displayData  value is2:%@", self.displayData);  
</code></pre>

<p><code>allData</code> works fine but I got an error on the <code>displayData</code></p>

<pre><code>2011-12-13 14:59:23.875 IPhone[352:207] -[__NSArrayM getObjects:andKeys:]: unrecognized selector sent to instance 0x59e1c20
2011-12-13 14:59:23.878 IPhone[352:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM getObjects:andKeys:]: unrecognized selector sent to instance 0x59e1c20'
*** Call stack at first throw:
</code></pre>

<p>Is it possible to pass data from  NSDictionary to NSMutableDictionary ?</p>
