Flutter: pub get failed

Question

Flutter project showing me a warning 'Packages get' has not been run with suggested solutions,

• Get Dependencies
• Upgrade Dependencies
• Ignore

As suggested by Darky, in this answer to go ahead with 'Get Dependencies'

I tried it but it shows me an error:

pub get failed

/SoftSources/Flutter/flutter/bin/flutter --no-color packages get
Running "flutter packages get" in catalog...
Incompatible version constraints on test:
- flutter_test 0.0.0 depends on version 0.12.30+3
- sample_catalog depends on version 0.12.30+4
pub get failed (1)
Process finished with exit code 1

An error indicates an issue with the version of the project (or something else), where should change it in my flutter project?

Edit: pubspec.yaml

name: sample_catalog
description: A collection of Flutter sample apps
dependencies:
  flutter:
    sdk: flutter
  path: 1.5.1

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_driver:
    sdk: flutter

  args: 1.3.0 # TRANSITIVE DEPENDENCY
  async: 2.0.4 # TRANSITIVE DEPENDENCY
  barback: 0.15.2+14 # TRANSITIVE DEPENDENCY
  boolean_selector: 1.0.2 # TRANSITIVE DEPENDENCY
  charcode: 1.1.1 # TRANSITIVE DEPENDENCY
  cli_util: 0.1.2+1 # TRANSITIVE DEPENDENCY
  collection: 1.14.5 # TRANSITIVE DEPENDENCY
  convert: 2.0.1 # TRANSITIVE DEPENDENCY
  crypto: 2.0.2+1 # TRANSITIVE DEPENDENCY
  csslib: 0.14.1 # TRANSITIVE DEPENDENCY
  file: 2.3.6 # TRANSITIVE DEPENDENCY
  glob: 1.1.5 # TRANSITIVE DEPENDENCY
  html: 0.13.2+2 # TRANSITIVE DEPENDENCY
  http: 0.11.3+16 # TRANSITIVE DEPENDENCY
  http_multi_server: 2.0.4 # TRANSITIVE DEPENDENCY
  http_parser: 3.1.1 # TRANSITIVE DEPENDENCY
  intl: 0.15.2 # TRANSITIVE DEPENDENCY
  io: 0.3.2+1 # TRANSITIVE DEPENDENCY
  isolate: 1.1.0 # TRANSITIVE DEPENDENCY
  js: 0.6.1 # TRANSITIVE DEPENDENCY
  json_rpc_2: 2.0.7 # TRANSITIVE DEPENDENCY
  logging: 0.11.3+1 # TRANSITIVE DEPENDENCY
  matcher: 0.12.1+4 # TRANSITIVE DEPENDENCY
  meta: 1.1.2 # TRANSITIVE DEPENDENCY
  mime: 0.9.6 # TRANSITIVE DEPENDENCY
  mockito: 2.2.3 # TRANSITIVE DEPENDENCY
  multi_server_socket: 1.0.1 # TRANSITIVE DEPENDENCY
  node_preamble: 1.4.0 # TRANSITIVE DEPENDENCY
  package_config: 1.0.3 # TRANSITIVE DEPENDENCY
  package_resolver: 1.0.2 # TRANSITIVE DEPENDENCY
  plugin: 0.2.0+2 # TRANSITIVE DEPENDENCY
  pool: 1.3.4 # TRANSITIVE DEPENDENCY
  pub_semver: 1.3.2 # TRANSITIVE DEPENDENCY
  quiver: 0.28.0 # TRANSITIVE DEPENDENCY
  shelf: 0.7.2 # TRANSITIVE DEPENDENCY
  shelf_packages_handler: 1.0.3 # TRANSITIVE DEPENDENCY
  shelf_static: 0.2.7 # TRANSITIVE DEPENDENCY
  shelf_web_socket: 0.2.2 # TRANSITIVE DEPENDENCY
  source_map_stack_trace: 1.1.4 # TRANSITIVE DEPENDENCY
  source_maps: 0.10.4 # TRANSITIVE DEPENDENCY
  source_span: 1.4.0 # TRANSITIVE DEPENDENCY
  stack_trace: 1.9.1 # TRANSITIVE DEPENDENCY
  stream_channel: 1.6.3 # TRANSITIVE DEPENDENCY
  string_scanner: 1.0.2 # TRANSITIVE DEPENDENCY
  term_glyph: 1.0.0 # TRANSITIVE DEPENDENCY
  test: 0.12.30+4 # TRANSITIVE DEPENDENCY
  typed_data: 1.1.5 # TRANSITIVE DEPENDENCY
  utf: 0.9.0+4 # TRANSITIVE DEPENDENCY
  vector_math: 2.0.5 # TRANSITIVE DEPENDENCY
  vm_service_client: 0.2.4+1 # TRANSITIVE DEPENDENCY
  watcher: 0.9.7+7 # TRANSITIVE DEPENDENCY
  web_socket_channel: 1.0.7 # TRANSITIVE DEPENDENCY
  yaml: 2.1.13 # TRANSITIVE DEPENDENCY

flutter:
  uses-material-design: true

Answer 1

Replace inside your devDependencies

test: 0.12.30+4 # TRANSITIVE DEPENDENCY with test: 0.12.30+3

Or you can potentially switch to master branch on flutter. Because you most likely clone an example of a project based on flutter's master