Hi @Rachel! Welcome to the Joulescope forum, and sorry to hear that you are having issues with your Joulescope. Thank you for the description and log file. It appears that the sensor-side of your Joulescope is not powering up correctly.
We did have one issue that a firmware update could address. Would you mind trying to update the firmware manually? You can follow the instructions in this post.
If that fixes things, great! If not, could you please email support at joulescope dot com? Reference this post, provide your original purchase info along with your shipping address, email, & phone number, and we will process your warranty replacement promptly.