If you can share more context (device model, where you got the tool, exact error), I can give a safer, more specific answer.
: Written in the efficient AutoIT scripting language, meaning it loads instantly and requires minimal system resources. System Requirements
Auto-parsing, raw IMEI-to-HEX translation, and injection routines.
: Close the tool, unplug the USB cable, change to a different USB port, and verify that Device Manager still shows the Qualcomm Diagnostic entry without any yellow exclamation triangles.