Create Accounting Program Completed with Warning

Hi all,

I found problem when I run create accounting program. Status for create accounting program is completed warning. I see the output and error message is 'The GL date is not in an open or a future enterable period.  Please select a valid GL date or open the period'. But, I'm sure once it has been opened. What should I do?? Log message:

Subledger Accounting: Version : 12.0.0

Copyright (c) 1979, 1999, Oracle Corporation. All rights reserved.

XLAACCUP module: Accounting Program
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Current system time is 15-AUG-2012 11:13:26

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**Starts**15-AUG-2012 11:13:26
**Ends**15-AUG-2012 11:13:28
Unit Processor completed normally with some events in error
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Start of log messages from FND_FILE
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15-AUG-2012 11:13:26 - Executing Unit Processor ...
15-AUG-2012 11:13:26 - Initializing variables
15-AUG-2012 11:13:26 - Security Context Set 
15-AUG-2012 11:13:26 - Ready to cache the Application and Ledger Level Sources ...
15-AUG-2012 11:13:26 - Cached the Application and Ledger Level Sources
15-AUG-2012 11:13:26 - Entering the loop to read document units from the queue ...
15-AUG-2012 11:13:26 - Checking status of the parent Accounting Program
15-AUG-2012 11:13:26 - Dequeuing the unit