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Failed to activate data set.

Hi al,

I'm trying to modify the image targets part of sample code for iOS and tried to load my own device dataset downloaded from the website.

The application crashes with this error Failed to activate data set.

I think this is where it crashes if (!objectTracker->activateDataSet(theDataSet))

        {

            NSLog(@"Failed to activate data set.");

  can you tell me where the problem could be when  

015-12-15 13:43:44.142 Vuforia[4339:1451706] loadObjectTrackerDataSet (StonesAndChips.xml)

2015-12-15 13:43:44.143 Vuforia[4339:1451706] ObjectTracker: Successfully created dataset

2015-12-15 13:43:44.145 Vuforia[4339:1451706] INFO: successfully loaded data set

2015-12-15 13:43:44.226 Vuforia[4339:1451706] loadObjectTrackerDataSet (Tarmac.xml)

2015-12-15 13:43:44.227 Vuforia[4339:1451706] ObjectTracker: Successfully created dataset

2015-12-15 13:43:44.227 Vuforia[4339:1451706] INFO: successfully loaded data set

2015-12-15 13:43:44.275 Vuforia[4339:1451706] loadObjectTrackerDataSet (CampsitesDB.xml)

2015-12-15 13:43:44.276 Vuforia[4339:1451706] ObjectTracker: Successfully created dataset

2015-12-15 13:43:44.276 Vuforia[4339:1451706] INFO: successfully loaded data set

2015-12-15 13:44:00.996 Vuforia[4339:1451706] Failed to activate data set.

2015-12-15 13:44:00.998 Vuforia[4339:1451706] Failed to activate dataset

2015-12-15 13:44:01.005 Vuforia[4339:1451706] Error initializing AR:Error Domain=vuforia_sample_application Code=121 "(null)"