SQL Maintenance Rebuild Fails

I am pretty new to SQL and I have this maintenance job that keeps failing and I am not sure how to troubleshoot this. I have troubleshot other job failures with google help to success but this one is eluding me. Any help is appreciated. Here is the log...BTW..is there an easier way to read these logs, or does it just take time and experience?

Date        2/1/2015 4:00:00 AM
Log     Job History (SERVER MAINTENANCE.REBUILD)

Step ID     1
Server      SERVER
Job Name        SERVER MAINTENANCE.REBUILD
Step Name       REBUILD
Duration        04:01:38
Sql Severity        0
Sql Message ID      0
Operator Emailed        
Operator Net sent       
Operator Paged      
Retries Attempted       0

Progress: 2015-02-01 06:00:01.80 Source: Rebuild Index Task Executing query "ALTER INDEX [DTA_reports_indexcolumn_index2] ON [d...".: 40% complete End Pro... The package execution fa... The step failed.