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Failed to load dataset on iphone 5 but working with iphone 4.

 

my application is running perfectly on iphone4(ios 7). 

But on iphone5 (ios 6.1.3). giving Errors on loading Dataset  Failed to load dataset.

Development enviornment is :

vuforia SDK v is 2.6.8

Mac osx 1.8.5

Xcode5

deployment target ios 6.0

help please ,any idea or workout aroune this.