getting error in EChart library [__NSCFString value] - ios

Question

I am using EChart library, trying to make bar chart in iPad. I did make everything like in demo project but getting error :
-[__NSCFString value]: unrecognized selector sent to instance 0x8bba220
2014-08-18 08:28:44.684 STAT_V2_iPAD[19187:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString value]: unrecognized selector sent to instance 0x8bba220'
and here is the error code after debugging :
/** The highest value among the whole chart*/
- (EColumnDataModel *) highestValueEColumnChart:(EColumnChart *) eColumnChart{
EColumnDataModel *maxDataModel = nil;
float maxValue = -FLT_MIN;
NSLog(#"After FLT_MIN : %.f",FLT_MIN);
for (EColumnDataModel *dataModel in MergedArr)
{
NSLog(#"Data.Value = %f",dataModel.value);
if (dataModel.value > maxValue)
{
NSLog(#"inside ifd");
maxValue = dataModel.value;
maxDataModel = dataModel;
}
}
NSLog(#"Finished MAX %.f",maxDataModel.value);
return maxDataModel;
}

Answer 1

Problem is your dataModel holds NSString instead of EColumnDataModel . Below answer will prevent the crash but you need to find how string takes place?
-(EColumnDataModel *) highestValueEColumnChart:(EColumnChart *) eColumnChart{
EColumnDataModel *maxDataModel = nil;
float maxValue = -FLT_MIN;
NSLog(#"After FLT_MIN : %.f",FLT_MIN);
for (EColumnDataModel *dataModel in MergedArr)
{
if([dataModel isKindOfClass:[EColumnDataModel class]]){
NSLog(#"Data.Value = %f",dataModel.value);
if (dataModel.value > maxValue)
{
NSLog(#"inside ifd");
maxValue = dataModel.value;
maxDataModel = dataModel;
}
}
}
NSLog(#"Finished MAX %.f",maxDataModel.value);
return maxDataModel;
}