apollo-ios: Cannot read property 'getMutationType' of undefined

Now using node v8.15.0 (npm v6.4.1)
 ›   Warning: apollo update available from 1.9.2 to 2.1.8
++ npx --no-install apollo codegen:generate '--queries=./services/graphQl/CreateNewPost.graphql
./services/graphQl/DeletePost.graphql
./services/graphQl/GetComments.graphql
./services/graphQl/PostComments.graphql
./services/graphQl/UpdatePost.graphql' --schema=schema.json API.swift
›   Warning: apollo update available from 1.9.2 to 2.1.8
[12:43:55] Loading Apollo config [started]
[12:43:55] Loading Apollo config [completed]
[12:43:55] Resolving GraphQL document sets and dependencies [started]
[12:43:55] Scanning for GraphQL queries (5 found) [title changed]
[12:43:55] Scanning for GraphQL queries (5 found) [completed]
[12:43:55] Generating query files [started]
[12:43:55] Generating query files with 'swift' target [title changed]
[12:43:55] Generating query files with 'swift' target [failed]
[12:43:55] → Cannot read property 'getMutationType' of undefined
TypeError: Cannot read property 'getMutationType' of undefined

Getting this error i researched a bit about it and i gone through many steps as per mentioned in internet

1. Moving schema.json file into the place where AppDelegate lies
2. sudo npm install --save graphql Updating graphQl dependencies
3. And i upgraded my apollo to using sudo npm install -g apollo@2.1.8 and i checked it apollo/2.1.8 darwin-x64 node-v10.14.2 (checked from the project root folder)
4. sudo npm install -g apollo upgraded into latest apollo 2.3.0
5. Also tried running passing --passthroughCustomScalars: $APOLLO_FRAMEWORK_PATH/check-and-run-apollo-cli.sh codegen:generate --queries="$(find . -name '*.graphql')" --passthroughCustomScalars --schema=schema.json API.swift

even all these steps i still getting the error , i am currently using the script from the apollo graphql ios documentation , and the version i am using is 0.9.5