build with gradle failing

[computerlyrik]

hi, i am new to gradle.

cloned repo, put holographlibrary into libs/ folder, built running

/usr/bin/gradle fails with

/usr/bin/gradle

FAILURE: Build failed with an exception.

• Where:
  Build file '/home/cf/projects/openvidonn/libs/DatePreference/build.gradle' line: 14

• What went wrong:
  A problem occurred evaluating project ':libs:DatePreference'.

  Could not find method runProguard() for arguments [false] on BuildType_Decorated{name=release, debuggable=false, testCoverageEnabled=false, jniDebuggable=false, pseudoLocalesEnabled=false, renderscriptDebuggable=false, renderscriptOptimLevel=3, applicationIdSuffix=null, versionNameSuffix=null, minifyEnabled=false, zipAlignEnabled=true, signingConfig=null, embedMicroApp=true, mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[], mManifestPlaceholders={}}.

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

BUILD FAILED

[bunny1985]

http://stackoverflow.com/questions/27078075/gradle-dsl-method-not-found-runproguard