Maybe you should try to perform a clean install of the ASIO driver.
1. Uninstall previously installed ASIO driver
2. Reboot your computer before re-installing the ASIO Driver
3. Make sure your amp is not connected to the computer with the Spark USB Cable.
4. Install ASIO drivers and plug the USB cable when you have a “Next” button appearing after the ASIO driver files were installed.
ASIO Driver can be download on Positive Grid website
If issue is not fixed you should have a look at this guide