This is the message that I see in the eclipse error log.
Secure Store could not get the master password from the OS key fob. Make sure that this application has access to the OS keychain. If the error persists, you can use the password recovery function, or you can delete and restore the safe store.
So, as others said, if you delete the secure_storage file and it should fix the problem. On mac it is better to use the command line.
/Users/< userid >/.eclipse/org.eclipse.equinox.security
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