Build app with epub problem

[pavannx]

Hello, when I try build my app using the epub package, the Assemble Debug gives me the following error:

uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [:epub_kitty] C:\Users\mpavan\Desktop\pdf_viewer\pdfp\build\epub_kitty\intermediates\library_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
Suggestion: use a compatible library with a minSdk of at most 16,
or increase this project's minSdk version to at least 21,
or use tools:overrideLibrary="com.xiaofwang.epub_kitty" to force usage (may lead to runtime failures)

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:processDebugManifest'.

Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [:epub_kitty] C:\Users\mpavan\Desktop\pdf_viewer\pdfp\build\epub_kitty\intermediates\library_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 16
Suggestion: use a compatible library with a minSdk of at most 16,
or increase this project's minSdk version to at least 21,
or use tools:overrideLibrary="com.xiaofwang.epub_kitty" to force usage (may lead to runtime failures)

[silviocandido]

File = android/app/build.gradle
Modify this = minSdkVersion 16
to = minSdkVersion 21

[pavannx]

@silviocandido Thks man, the issue I complained about was solved, but I got a new one.

SDK location not found. Define location with sdk.dir in the local.properties file or with an ANDROID_HOME environment variable.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

[silviocandido]

File = android/local.properties
Value to my MAC = sdk.dir=/Users/admin/Library/Android/sdk
Reference = https://stackoverflow.com/questions/27620262/sdk-location-not-found-define-location-with-sdk-dir-in-the-local-properties-fil

[pavannx]

I tried every single answer that had on this link but none of then solved my issue.

I'm trying to use this plugin/package on my app to read and search words in a pdf reader, but i've got this SDK issue and can't build my application anymore.

I already read all about this and can't find a solution

PS: my computer is a Windows and Im working with Flutter.

[pavannx]

Update: I solved my last problem (SDK path), but now I got a new one:

Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.

Could not resolve all task dependencies for configuration ':app:debugCompileClasspath'.
Could not find com.github.codetoart:r2-shared-kotlin:1.0.4-2.
Required by:
project :app > com.folioreader:folioreader:0.5.4
Could not find com.github.codetoart:r2-streamer-kotlin:1.0.4-2.
Required by:
project :app > com.folioreader:folioreader:0.5.4

all this because I tried use the plugin epub lol