TestGenerator: not enough memory for 'GBPUSD5'

When i backtest EA says error as :

TestGenerator: not enough memory for 'GBPUSD5'

what will be the problom?

sheriffonline:

When i backtest EA says error as :

TestGenerator: not enough memory for 'GBPUSD5'

what will be the problom?

What dates are you using ?