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Build Identifier: I20111209-2100 !SESSION 2012-01-25 15:10:30.937 ----------------------------------------------- eclipse.buildId=I20111209-2100 java.version=1.7.0_02 java.vendor=Oracle Corporation BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US Command-line arguments: -os win32 -ws win32 -arch x86 !ENTRY org.eclipse.equinox.p2.operations 4 0 2012-01-25 15:15:55.273 !MESSAGE Operation details !SUBENTRY 1 org.eclipse.equinox.p2.director 4 1 2012-01-25 15:15:55.273 !MESSAGE Cannot complete the install because one or more required items could not be found. !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-01-25 15:15:55.273 !MESSAGE Software being installed: Android Development Tools 16.0.1.v201112150204-238534 (com.android.ide.eclipse.adt.feature.group 16.0.1.v201112150204-238534) !SUBENTRY 2 org.eclipse.equinox.p2.director 4 0 2012-01-25 15:15:55.273 !MESSAGE Missing requirement: Android Development Tools 16.0.1.v201112150204-238534 (com.android.ide.eclipse.adt.feature.group 16.0.1.v201112150204-238534) requires 'org.eclipse.wst.sse.core 0.0.0' but it could not be found Reproducible: Always Steps to Reproduce: 1.Install New Software ---> Add---> Add Repository 2.URL https://dl-ssl.google.com/android/eclipse/ or http://dl-ssl.google.com/android/eclipse/ or Downloading the ADT manually & Installing it from Local/Archive 3. Error
Sounds like you need to install the source editing tools from the Web Tools Platform first. I suggest you check with Google to understand what requirements its Android plug-in wants.
I couldnt find how to install from here http://download.eclipse.org/webtools/downloads/drops/R3.3.1/R-3.3.1-20110915193224/ i am not sure wat is missing in Eclipse, can u please refer this Question which i asked. http://stackoverflow.com/questions/8988741/installing-android-plugin-error-with-eclipse-juno-4-2-0