Why am I getting Application Error on Azure Devops Deploy? – Docker

I have an issue with Azure DevOps deployment, i’m getting this screen after successfully deploying an app, it does work on localhost but doesn’t work on Azure:

🙁 Application Error
If you are the application administrator, you can access the diagnostic resources.

This is my YAML file:

    pool:
  name: Azure Pipelines
steps:
- task: Docker@0
  displayName: 'Build an image'
  inputs:
    containerregistrytype: 'Container Registry'
    dockerRegistryConnection: companyname
    dockerFile: dockerfile.prod

- task: Docker@0
  displayName: 'Push an image'
  inputs:
    containerregistrytype: 'Container Registry'
    dockerRegistryConnection: companyname
    action: 'Push an image'

- task: AzureRmWebAppDeployment@4
  displayName: 'Azure App Service Deploy: sigmacem'
  inputs:
    azureSubscription: 'Azure subscription 1(86f0frg6-7177-40a1-2yi5-e1fc4be92716)'
    appType: webAppContainer
    WebAppName: companyname
    DockerNamespace: 'user/companyname:latest'
    DockerRepository: 'user/companyname:latest'

From building, pushing the docker image and from deploying to Azure Cloud.And also dockerfile.prod:

# build environment
FROM node:13.12.0-alpine as build
WORKDIR /app
ENV PATH /app/node_modules/.bin:$PATH
COPY package.json ./
COPY package-lock.json ./
RUN npm install --silent
RUN npm ci --silent
RUN npm install [email protected] -g --silent
COPY . ./
RUN npm run build

# production environment
FROM nginx:stable-alpine
COPY --from=build /app/build /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

Please, help me, because i’ve already tried so many solutions and not even once it worked on Azure cloud