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Talend application not opening and pointing to .metadata/.log file

I was testing my developed talend jobs and talend got suddenly crashed. when I try to open talend application again then it was not opening talend and was pointing me to <talend install dir> \workspace\.metadata\.log file.
The .log file was saying about
!ENTRY org.eclipse.osgi 4 0 2013-01-23 09:15:39.465
!MESSAGE Application error
java.lang.RuntimeException: The service org.talend.core.model.migration.IMigrationToolService has not been registered.
at org.talend.core.GlobalServiceRegister.getService(
at org.talend.rcp.intro.Application.start(
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(
at org.eclipse.equinox.launcher.Main.basicRun(
after reading few posts yesterday, I copied/backedup the workspace folder and deleted old talend install folder from c: drive. Installed again talend and copied back old workspace folder under <talend install dir>.
BUT still i am getting same error and not able to open my project which has my developed Talend jobs.
I am using Talend version V5.2.1 and first time talend user so did not had the exported copy of developed jobs.
does talend has any solution to this or I have lost all my hardwork and need to redevelope my jobs again?
please help
Community Manager

Re: Talend application not opening and pointing to .metadata/.log file

If you have backup the workspace, select a new workspace and open the Talend studio, right click on Job Designs and select 'import items' option to import all items from the old workspace.
Let me know if it works!
Talend | Data Agility for Modern Business
One Star

Re: Talend application not opening and pointing to .metadata/.log file

Just delete .metadata folder and run Talend again and reimport your project(s).