Error while executing DEMO

[puppinoo]

Hi,
really newbie about docker so I'm sorry if question is silly and depends on my mistakes.
I'm trying to install demo in https://github.com/poanetwork/eth-to-bnc-bridge/blob/master/DEMO.md but I'm receiving error while executing ./demo/start-binance-environment.sh
all the previous commands worked.
Any help is MUCH appreciated.

Thanks a lot.
Pino.

EDIT: Trying to understand how to paste code portion correctly. Sorry about that too.

EDIT#2: I now realize that is probably a totally different project. Sorry for misunderstanding. But I need to do just that. My users need to be able to move funds cross chain from ETH to BNB on BSC. Is that possible in any way not using Binance Bridge (or using that programmatically)?.

Pinuccio@ubuntu:/src/eth-to-bnc-bridge$ ./demo/start-binance-environment.sh
[sudo] password di pinuccio:
Restarting binance test network
Building required binaries
Running environment
Building node
Sending build context to Docker daemon 2.048kB
Step 1/9 : FROM alpine:3.9.4
---> 055936d39205
Step 2/9 : ARG BNC_VERSION=0.6.2
---> Using cache
---> 8a81f150c803
Step 3/9 : WORKDIR /bnc
---> Using cache
---> 12dde7ce0ea6
Step 4/9 : COPY --from=testnet-binaries /binaries/fullnode/testnet/${BNC_VERSION}/linux/bnbchaind ./
invalid from flag value testnet-binaries: pull access denied for testnet-binaries, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
ERROR: Service 'node' failed to build : Build failed
pinuccio@ubuntu:/src/eth-to-bnc-bridge$