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:
By default, when using a rules file, Essbase creates an error log.
See Verifying that Essbase Server Is Available and Verifying that the Data Source Is Available
If so, you probably received a timeout error on the client. See Essbase - Stopping Data Loads or Dimension Builds / Recovering from a 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:
See Essbase - Loading a Subset of Records from a Data Source.
See Requirements for Valid Data Load Rules Files and Requirements for Valid Dimension Build Rules Files.