Installing High Sierra on old laptop. [Opencore]

Hi,

This is not my first time using the opencore method to install macos. I have done it on my main PC which works pretty well. Now I would like to try the same thing on my old Toshiba L640 laptop. The specs are :

Core i5 m450 (Arrandale)

8gb DDR3 RAM

ATI HD 5145 GPU (TeraScale Architecture)

320GB HDD

Conexant HD Audio (Can't figure out the exact model. Vendor 14F1 5069)

AR5182 Ethernet controller

Broadcomm BCM9431 3HMGB Wi-fi adapter

This laptop doesn't have integrated graphics (Intel HD) and this is what's making me confused about following the Opencore guide. In the guide, it talks about iGPU only as far as I know.

Opencore guide

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When trying to install I get the following message as in the picture and then restarts which then loops. I don't know if it's related to the GPU but I can't get past this screen.

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Opencore message (error)

My config.plist and Opencore log are below, I would be very glad if someone can help me with this. I have followed the guide as carefully as I could twice and still get the same error. Thank you.

Config.plist - https://drive.google.com/file/d/1gqXxQiEHs61IZkiMoj7kIlBOnHxNcAEw/view?usp=sharing

Opencore log - https://drive.google.com/file/d/1_idqBL7hEZXN-PPv6aAVILtYBA0B93rd/view?usp=sharing