Clear cache for items not working with multiple items

APEX 4.0, 11g. I've made a session state process that clears cache for items (item_1, item_2, item_3) but I keep getting an error "Unexpected error, unable to find item name at application or page level" I have now created 3 session state processes, each with one page item in it, and it works fine but as soon as I try to put more than one item in the process field, separated by commas, I get this error. Is there some other setting I have to change to make it accept multiple values in this field?

No, I wasn't using the parenthesis... just the items separated by a comma.
I don't want to clear the cache for all page items, just these 3. It works okay in 3 separate clear cache for item processes, just thought it was odd that I can't put all three items into one process separated by commas.

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Error ERR-1002 Unable to find item ID for item "P12_BIT " in application "123".
OK
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Jelena,
In the message:
Error ERR-1002 Unable to find item ID for item "P12_BIT " in application "123".
I see some whitespace after the item name. Looks like we're not preparing that string as well as we should. Please try removing whitespace from the comma-delimited list of item names in the process definition and let us know if that doesn't work.
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Hi ,
This is a sort of performance issue , because your program takes more than the max time set for the program to execute in foreground.
There are many stuff in program which will hamper your performance.
I will list down a few
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*Reward points if replay is helpful

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How to clear cache for items after submitting the page ?

db11gxe , apex 4.0 , firefox 24 ,
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Message was edited by:
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Thanks Neil. Now it's working.
For this One line clue - I really searched a lot.
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If checking this link For Reference -->
Search 'SET HANDLER' in Google for sample programs.
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