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Steps to repro 1. Have the running platform as current target in 3.8 M4 build 2. Create an RCP app using Mail template 3. Export the app as product 4. Create a new target and add this new product as Installation location 5. Switch to this target Problem: Each time the target pref page is opened the following errors are logged eclipse.buildId=I20111209-1447 java.fullversion=JRE 1.6.0 IBM J9 2.4 Windows 7 amd64-64 jvmwa6460sr9-20110624_85526 (JIT enabled, AOT enabled) J9VM - 20110624_085526 JIT - r9_20101028_17488ifx17 GC - 20101027_AA BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_IN Framework arguments: -product org.eclipse.sdk.ide Command-line arguments: -product org.eclipse.sdk.ide -data C:\PDE\workspaces\workspace.pde.git/../runtime-New_configuration -dev file:C:/PDE/workspaces/workspace.pde.git/.metadata/.plugins/org.eclipse.pde.core/New_configuration/dev.properties -os win32 -ws win32 -arch x86_64 -consoleLog Error Mon Dec 19 20:54:19 IST 2011 Could not find a org.eclipse.pde.core.targetLocations extension for type: org.eclipse.pde.core.InstallableUnit
No stack trace?
no.
I don't see this, perhaps you had a bad target definition file somewhere? Closing as WORKSFORME.