SQL & PL/SQL

Hi
I am unable to run the following query in TOAD.

SELECT A.* FROM (SELECT VC.CAMPAIGN_NUMBER," +
"VC.CAMPAIGN_TITLE,VC.CAMPAIGN_DESC,VC.START_DATE,VC.END_DATE,VC.CAMPAIGN_TYPE,VC.APPLICABILITY," +
"VC.CAMPAIGN_PRIORITY FROM VM_CAMPAIGN VC WHERE VC.APPLICABILITY = 'Y' and VC.COUNTRY_CODE = ? " +
"and VC.LANGUAGE_CODE = ? AND VC.CAMPAIGN_TYPE = ? AND SYSDATE BETWEEN VC.START_DATE AND " +
"VC.END_DATE AND NOT EXISTS (SELECT 'X' FROM VM_CAMPAIGN_VIN VCV WHERE (VCV.VIN = ? AND " +
"VCV.CAMPAIGN_NUMBER = VC.CAMPAIGN_NUMBER))UNION SELECT VC.CAMPAIGN_NUMBER,VC.CAMPAIGN_TITLE," +
"VC.CAMPAIGN_DESC,VCV.START_DATE,VCV.END_DATE,VC.CAMPAIGN_TYPE,VC.APPLICABILITY,VC.CAMPAIGN_PRIORITY " +
"FROM VM_CAMPAIGN_VIN VCV ,VM_CAMPAIGN VC WHERE VCV.VIN = ? AND " +
"VCV.CAMPAIGN_NUMBER = VC.CAMPAIGN_NUMBER AND VC.COUNTRY_CODE = ? AND VC.LANGUAGE_CODE = ? AND " +
"VC.CAMPAIGN_TYPE = ? AND SYSDATE BETWEEN VCV.START_DATE AND VCV.END_DATE AND SYSDATE BETWEEN " +
"VC.START_DATE AND VC.END_DATE) A ORDER BY A.CAMPAIGN_PRIORITY DESC, A.END_DATE

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I am getting "Missing double quote in identifier"

I am not sure how to rectify this SQL code. Any suggestions are welcome

thanks in advance