It looks like you're using the Superninja root method. For me, that didn't work and I had the same error.
KBC rooting method.
Download the attached .zip file for rooting.
Turn your phone on.
Go to About Phone in Settings.
Tap Build Number 7 times to enable Developer Options
Go to Developer Options and tick Android Debugging or USB Debugging (I forget what it's called)
Connect phone via USB to your PC.
Select USB charging only mode from notifications on your g2.
Unzip the g2_support_tool_v1.7
Double click the file runme.bat
Follow the order in the CMD window.
1. Image backup
2. Install Custom Recovery
3. Get a permanent root (with superuser)
Do 1, then 2, then 3 in that order. If you are successful your phone will reboot automatically and install superuser in CWM.
Do not disconnect your phone.
If you are able to complete 1, 2, and 3, then you can select 9 to exit the root tool and disconnect your phone.
To boot into recovery, turn phone off, then while turning it on again, hold the power button and volume up button (note: USB must be disconnected otherwise it will go into download mode)
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