[Fri Dec 12 13:13:32 2008]Local/ESSBASE0///Error(1012004)
Invalid member name Markett
When you look at the error messages in the log, the root cause of the error may or may not be apparent. In the example above, it is apparent that the member name is spelled incorrectly. Some error messages, however, are not so easy to decipher. Recently, I found that Oracle has a nice reference site that sometimes gives you much better information on an Essbase error:
http://download.oracle.com/docs/cd/E10530_01/doc/epm.931/html_esb_error/erhelp.htm
The site provides a nice summary for this particular error:

Unfortunately, not all Essbase errors are documented on the site. In those circumstances, it is best to use your favorite internet search engine to search for "Essbase error xxxxxxx'" where the x's represent the error number you are seeing in your logs. It is almost certain that you are not the first person to experience the same issue and you will often find the answer already posted somewhere online. If you don't find the solution posted, then post a question on one of the forums. Of course, if all else fails you can always call Oracle Tech Support!