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I suppose you have read the document TalendHelpCenter: Prior to installing the Talend products and TalendHelpCenter:Installing Talend Studio for the first time.
What's your OS?
Try to restore the items to see if it is OK with you.
1. Back up the workspace.
2. Delete the workspace and restart the studio
3. Import all items from the backup of workspace done in step1.
My OS is Wondows 7 Enterprise. There was another version of java installed, i.e., jdk1.8.0. After uninstalling the same, i am able run my jobs and also seeing the code tab