Unable to open report design file after Upgrade to IR02A

Document ID : KB000008589
Last Modified Date : 14/02/2018
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Issue:

After upgrade CA ALC 3.0 to IR2A we're unable to open Report Design Files. This error is shown:
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An unexpected error has been detected. If the problem persists, please contact the System Administrator for assistance.
java.lang.NoClassDefFoundError: org/eclipse/birt/report/designer/internal/ui/editors/ReportEditorInput

java.lang.NoClassDefFoundError:
org/eclipse/birt/report/designer/internal/ui/editors/ReportEditorInput
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It is not possible to edit reports in order to publish some important modifications.

Resolution:

To resolve this problem delete the workspace for ALC:
<USER_HOME>/.alc