Creating two sin signals using function generator.vi example

hi all. i want to create two sin signals with different parameters using function generator.vi example. i tried to modify the example by copying the code and try to output two sin signals on different channels of the DAQ but error message saying that you are validating of the AO write buffer . attached is the file. how can i modify it to solve the problem?!
Attachments:
function_generator2.vi ‏123 KB

Nidal,
Below is an example that illustrates how to generate different sine waves on two separate analog output channels.
Example

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