ERROR: Service 'app' failed to build : Build failed

[ashfaqsw]

Hi, I am facing error in build:

Switching to flutter channel 'beta'...
git: fatal: 'origin/beta' is not a commit and a branch 'beta' cannot be created from it
Switching channels failed with error code 128.
The command '/bin/sh -c flutter channel beta     && flutter upgrade     && flutter config --enable-web     && sudo apt-get update     && sudo apt-get install -y nginx     && sudo apt-get install -y chromium-browser     && sudo rm -rf /var/lib/apt/lists/*' returned a non-zero code: 128
ERROR: Service 'app' failed to build : Build failed