Order Preview Error Message

Hi,
I tried to order a product from our production site and used the Paypal option. It came up with an error message under "Order Preview" section in some pages. But if we kept continue until we reached Payment page, then this error message was disappeared. Do any body know how to fixed this error?

Order Preview
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* Error At 12/6/2009 7:56:23 PM
* CustomerRefID: 445691714-195623
* Session ID: 445691714
* Error Number: 13
* Error Source: Microsoft VBScript runtime error
* Error Description: Type mismatch
* Last Query: SELECT pcTEpt_StateCode FROM pcTaxEpt WHERE pcTEpt_StateCode=''CA'' AND ((pcTEpt_CategoryList like ''2,%'') OR (pcTEpt_CategoryList like ''%,2,%''))
* RequestMethod: POST
* ServerPort: 443
* HTTPS: on
* LocalAddr: 208.65.128.157
* HostAddress :118.69.224.37
* UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)
* URL: /productcart/pc/opc_OrderVerify.asp
* FormData: idpayment=2
* HTTP Headers:
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HTTP_CACHE_CONTROL:no-cache
HTTP_CONNECTION:keep-alive
HTTP_KEEP_ALIVE:300
HTTP_PRAGMA:no-cache
HTTP_CONTENT_LENGTH:11
HTTP_CONTENT_TYPE:application/x-www-form-urlencoded; charset=UTF-8
HTTP_ACCEPT:*/*
HTTP_ACCEPT_CHARSET:ISO-8859-1,utf-8;q=0.7,*;q=0.7
HTTP_ACCEPT_ENCODING:gzip,deflate
HTTP_ACCEPT_LANGUAGE:en-us,en;q=0.5
HTTP_COOKIE:pcfront%5FvisitedPrds=%2A1%2A; SavedCartGUID=49CF3B8B%2D4603%2D4133%2D9D12%2DD7C4E8D94B1A; ASPSESSIONIDQSBQAACR=HPMKAJKBLIDFBOKBNMMFHFKP
HTTP_HOST:www.johnwaynestockandsupply.com
HTTP_REFERER:https://www.johnwaynestockandsupply.com/productcart/pc/OnePageCheckout.asp
HTTP_USER_AGENT:Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15) Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)
HTTP_X_REQUESTED_WITH:XMLHttpRequest
*****************************
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Edited by matle - 06-December-2009 at 9:13pm