Problema at creation of twrp image

[Ruby90000]

When I try to assembly the twrp image(5.1) for my Lenovo Tab3 7 Essential (TB3-710I) with the device tree generated by twrpdgen, I get the errore "not found repo manifest for "omni_TB3" excluding the other part of the name due to the hyphen. I wait advice.

[Ruby90000]

ruby90@Ruby:$ . build/envsetup.sh
including device/lenovo/TB3710I/vendorsetup.sh
ruby90@Ruby:$ lunch

You're building on Linux

Lunch menu... pick a combo:
1. aosp_arm-eng
2. aosp_arm64-eng
3. aosp_mips-eng
4. aosp_mips64-eng
5. aosp_x86-eng
6. aosp_x86_64-eng
7. omni_TB3-710I-userdebug
8. omni_TB3-710I-eng

Which would you like? [aosp_arm-eng] 7
build/core/product_config.mk:222: *** Can not locate config makefile for product "omni_TB3". Stop.
Your device can't be found in device sources..
Traceback (most recent call last):
File "build/tools/roomservice.py", line 296, in
fetch_device(device)
File "build/tools/roomservice.py", line 265, in fetch_device
git_data = search_gerrit_for_device(device)
File "build/tools/roomservice.py", line 78, in search_gerrit_for_device
device_data = check_repo_exists(git_data, device)
File "build/tools/roomservice.py", line 58, in check_repo_exists
"exiting roomservice".format(device=device))
Exception: TB3 not found,exiting roomservice
build/core/product_config.mk:222: *** Can not locate config makefile for product "omni_TB3". Stop.

** Don't have a product spec for: 'omni_TB3'
** Do you have the right repo manifest?

** Invalid variant: '710I-userdebug'
** Must be one of user userdebug eng

here is what I am told.

[lopestom]

7. omni_TB3-710I-userdebug
8. omni_TB3-710I-eng

Change names in DT to omni_TB3_710I because source not accept - in the name omni_TB3-710I