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newbie question

I recently started using Objective-c/cocoa/xcode. I'm trying to parse a srt (subtitle) file.
The input file contains a string: 00:37:58,112 --> 00:38:01,324

I want to convert the time-index (string) to seconds (float): 37*60+58,112 = 2278.112

I am using the following code:

NSString * sTime, * eTime;
float sTimeFloat, eTimeFloat;

// Get file contents as a String
NSString * esTime = [ NSString stringWithContentsOfFile:filename]; 

// Create array with components
NSArray * time = [ esTime componentsSeparatedByString:@" --> " ];

// Time index 1
sTime = [ time objectAtIndex:0];

// Time index 2
eTime = [ time lastObject];

// Get seconds, float, Time index 1
sTimeFloat = [[sTime subStringWithRange:NSMakeRange(6,2)] floatValue];

When I compile this code I get the warning:
warning: 'NSString' may  not respond to '-subStringWithRange:'

I understand that there might be some variable type problem, but I cannot find out how to solve this? I ran into comparable problem multiple times before.

Any help would be appreciated!

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