Error: Error trying to ping. Error: Composer runtime (0.19.4) is not compatible with client (0.20.0)

Question

I'm simply trying to start a local composer server at my machine but I'm facing the following error :

Error: Error trying to ping. Error: Composer runtime (0.19.4) is not compatible with client (0.20.0)

However, my composer version looks perfectly fine -->

    npm list -g --depth=0
/home/paris/.nvm/versions/node/v8.11.3/lib
├── @ampretia/composer-wallet-cloudant@0.2.1
├── composer-cli@0.20.0
├── composer-rest-server@0.20.0
├── composer-runtime@0.20.0
├── generator-hyperledger-composer@0.19.5
├── loopback-connector-mongodb@3.6.0
├── npm@5.6.0
├── passport-github@1.1.0
└── yo@2.0.5

I already cleaned the images and etc...

Answer 1

The composer-runtime doesn't run client side, it is part of your business network running inside your fabric network. It looks like you have installed composer-runtime manually otherwise it would not be seen client side.

When you deployed your business network you used composer-cli at 0.19.4. Now you have upgraded to composer 0.20.0. The rule for compatibility is as follows composer_client version must be >= composer_runtime version and the minor version MUST be equal (minor version is the middle number). For example