If a data load or dimension build fails, the error log can be a valuable debugging tool. See Understanding and Viewing Dimension Build and Data Load Error Logs.
If there is no error log, check whether the following conditions exist:
The person running the data load set up an error log.
By default, when using a rules file, Essbase creates an error log.
The data source and Essbase Server are available.
See Verifying that Essbase Server Is Available and Verifying that the Data Source Is Available
Essbase Server crashed during the data load.
If so, you probably received a timeout error on the client. See Recovering from an Essbase Server Crash.
If the error log exists but is empty, Essbase does not think that an error occurred during loading. Check whether the following conditions exist:
The rules file contains selection or rejection criteria that rejected every record in the data source.
See Selecting Records and Rejecting Records.
The rules file validates properly.
See Requirements for Valid Data Load Rules Files and Requirements for Valid Dimension Build Rules Files`.