Problem in android studio

[itsoulos]

I have the following messages in android studio in Linux

Could not resolve all artifacts for configuration ':app:debugCompileClasspath'. Could not find any matches for com.android.support.constraint:constraint-layout:+ as no versions of com.android.support.constraint:constraint-layout are available. Searched in the following locations: file:/home/sheridan/Android/Sdk/extras/m2repository/com/android/support/constraint/constraint-layout/maven-metadata.xml file:/home/sheridan/Android/Sdk/extras/m2repository/com/android/support/constraint/constraint-layout/ file:/home/sheridan/Android/Sdk/extras/google/m2repository/com/android/support/constraint/constraint-layout/maven-metadata.xml file:/home/sheridan/Android/Sdk/extras/google/m2repository/com/android/support/constraint/constraint-layout/ file:/home/sheridan/Android/Sdk/extras/android/m2repository/com/android/support/constraint/constraint-layout/maven-metadata.xml file:/home/sheridan/Android/Sdk/extras/android/m2repository/com/android/support/constraint/constraint-layout/ https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/maven-metadata.xml https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/ Required by: project :app