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As per CRA, Error code 15 means:

You have indicated this is a pre-bankruptcy return. Please delete the selected financial data statements. They should not be transmitted with a pre-bankruptcy return.

You can say NO to the bankruptcy question and then NETFILE.

However, If it is your first time filing an income tax return to the CRA, then it means CRA doesn't have any of your information. So you will need to print and mail your return this year, and next year you will be able to NetFile.

You will need to go back to the FIle section of your return and choose print to mail.

Where to mail your paper return.

Thank you for choosing TurboTax.