Unable to determine Swift version

[RohithKilaparthi]

When I try to execute 'flutter run' command, there is an error which says

[!] Unable to determine Swift version for the following pods:
- `flutter_document_picker` does not specify a Swift version and none of the targets (`Runner`) integrating it have the `SWIFT_VERSION` attribute set. Please contact the author or set the
`SWIFT_VERSION` attribute in at least one of the targets that integrate this pod.

Flutter doctor doesn't quote any errors. Please look into the error and help me in resolving the error.

flutter run output

Launching lib/main.dart on iPhone Xʀ in debug mode...
Running pod install...                                              1.0s

CocoaPods' output:

↳

      Preparing

    Analyzing dependencies

    Inspecting targets to integrate

      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)

    Fetching external sources

    -> Fetching podspec for `Flutter` from `.symlinks/flutter/ios`

    -> Fetching podspec for `flutter_document_picker` from `.symlinks/plugins/flutter_document_picker/ios`

    -> Fetching podspec for `flutter_full_pdf_viewer` from `.symlinks/plugins/flutter_full_pdf_viewer/ios`

    -> Fetching podspec for `path_provider` from `.symlinks/plugins/path_provider/ios`

    -> Fetching podspec for `shared_preferences` from `.symlinks/plugins/shared_preferences/ios`

    -> Fetching podspec for `sqflite` from `.symlinks/plugins/sqflite/ios`

    -> Fetching podspec for `url_launcher` from `.symlinks/plugins/url_launcher/ios`

    Resolving dependencies of `Podfile`

    Comparing resolved specification to the sandbox manifest

      A FMDB

      A Flutter

      A flutter_document_picker

      A flutter_full_pdf_viewer

      A path_provider

      A shared_preferences

      A sqflite

      A url_launcher

    Downloading dependencies

    -> Installing FMDB (2.7.5)

      > Copying FMDB from `/Users/akki/Library/Caches/CocoaPods/Pods/Release/FMDB/2.7.5-2ce00` to `Pods/FMDB`

    -> Installing Flutter (1.0.0)

    -> Installing flutter_document_picker (0.0.1)

    -> Installing flutter_full_pdf_viewer (1.0.1)

    -> Installing path_provider (0.0.1)

    -> Installing shared_preferences (0.0.1)

    -> Installing sqflite (0.0.1)

    -> Installing url_launcher (0.0.1)

      - Running pre install hooks

    [!] Unable to determine Swift version for the following pods:

    - `flutter_document_picker` does not specify a Swift version and none of the targets (`Runner`) integrating it have the `SWIFT_VERSION` attribute set. Please contact the author or set the

    `SWIFT_VERSION` attribute in at least one of the targets that integrate this pod.

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/lib/cocoapods/installer/xcode/target_validator.rb:122:in `verify_swift_pods_swift_version'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/lib/cocoapods/installer/xcode/target_validator.rb:37:in `validate!'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/lib/cocoapods/installer.rb:578:in `validate_targets'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/lib/cocoapods/installer.rb:158:in `install!'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/lib/cocoapods/command/install.rb:51:in `run'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/lib/cocoapods/command.rb:52:in `run'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/gems/cocoapods-1.7.4/bin/pod:55:in `<top (required)>'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/bin/pod:22:in `load'

    /usr/local/Cellar/cocoapods/1.7.4/libexec/bin/pod:22:in `<main>'

Error output from CocoaPods:

↳

    [!] `<PBXGroup UUID=`97C146E51CF9000F007C117D`>` attempted to initialize an object with an unknown UUID. `CF3B75C9A7D2FA2A4C99F110` for attribute: `children`. This can be the result of a merge and

    the unknown UUID is being discarded.

    [!] Automatically assigning platform `ios` with version `8.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See

    `https://guides.cocoapods.org/syntax/podfile.html#platform`.

Error running pod install

Error launching application on iPhone Xʀ.

[RohithKilaparthi]

@sidlatau Can you look into the issue and help us in fixing the issue?

[sidlatau]

Several issues with the same error are already closed. Check this: https://github.com/sidlatau/flutter_document_picker/issues/26#issuecomment-497457035

[RohithKilaparthi]

Thanks, it worked.