SQL 2005 - The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator.

Please note, the SQL is handled dynamically by the SQL server, therefore items in my WHERE clause will look odd to you. Please disregard this because this is not an issue.

I am getting the following error I need some help with.

Msg 306, Level 16, State 2, Line 5
The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator.

/* Adjustments */

SET NOCOUNT ON

SELECT     
	Batch.Entry AS [Date Of Entry], 
	PatientProfile.[Last] + ', ' + PatientProfile.[First] AS Name, 
	dbo.FormatName(Guarantor.Prefix, Guarantor.First, Guarantor.Middle, Guarantor.Last, Guarantor.Suffix) AS [Guarantor],
	MedLists.Description AS [Adjustment Type], 
	ISNULL(vo.Description, 'No Owner') AS [Visit Owner],
	PatientVisit.TicketNumber, 
--	PatientVisitProcs.Code AS [Procedure Code], 
	SUM(TransactionDistributions.Amount) AS [Adjustment Amount], 
	PatientVisitProcs.DateOfServiceFrom, 
	ISNULL(CONVERT(varchar(255), Transactions.Note), ' ') AS Notes, 
	CASE WHEN 1 = 1 THEN ISNULL(ml.Description,ISNULL(ic.ListName,'No Insurance')) ELSE ISNULL(ic.ListName,'No Insurance') END AS InsuranceType

FROM         
	PaymentMethod 
	INNER JOIN VisitTransactions ON PaymentMethod.PaymentMethodId = VisitTransactions.PaymentMethodId 
	INNER JOIN Transactions ON VisitTransactions.VisitTransactionsId = Transactions.VisitTransactionsId 
	INNER JOIN TransactionDistributions ON Transactions.TransactionsId = TransactionDistributions.TransactionsId 
	INNER JOIN Batch ON PaymentMethod.BatchId = Batch.BatchId 
	INNER JOIN PatientVisit ON VisitTransactions.PatientVisitid = PatientVisit.PatientVisitId 
	INNER JOIN PatientProfile ON PatientVisit.PatientProfileId = PatientProfile.PatientProfileId 
	INNER JOIN Guarantor ON PatientProfile.GuarantorId = Guarantor.GuarantorId
	INNER JOIN MedLists ON Transactions.ActionTypeMId = MedLists.MedListsId 
	INNER JOIN PatientVisitProcs ON TransactionDistributions.PatientVisitProcsId = PatientVisitProcs.PatientVisitProcsId 
	LEFT OUTER JOIN InsuranceCarriers ic ON CASE WHEN 1 = 1 THEN PatientVisit.PrimaryInsuranceCarriersID ELSE VisitTransactions.InsuranceCarriersID END = ic.InsuranceCarriersID 
	LEFT OUTER JOIN MedLists ml ON ic.PolicyTypeMID = ml.MedListsID
	LEFT OUTER JOIN MedLists vo ON PatientVisit.VisitOwnerMID = vo.MedListsID

WHERE     
	Transactions.Type = 'A'
	AND --Filter on Source of Adjustment
	(
	('3' = PaymentMethod.Source)  OR
	('3' = '3')
	)
	AND  --Filter on adjustment type
	(
	(1 = 2 AND Transactions.ActionTypeMId IN (NULL)) OR
	(1 = 1)
	)
	AND  --Filter on doctor
	(
	(NULL IS NOT NULL AND PatientVisit.DoctorID IN (NULL)) OR
	(NULL IS NULL)
	)
	AND  --Filter on facility
	(
	(NULL IS NOT NULL AND PatientVisit.FacilityID IN (NULL)) OR
	(NULL IS NULL)
	)
	AND  --Filter on company
	(
	(NULL IS NOT NULL AND PatientVisit.CompanyID IN (NULL)) OR
	(NULL IS NULL)
	)
	AND -- Filter on Guarantor
	( 
	('656' IS NOT NULL AND Guarantor.GuarantorId IN(656)) 
 	OR '656' IS NULL 
	)
	AND  --Filter on Visit Owner
	(
	(1 = 2 AND PatientVisit.VisitOwnerMID IN (NULL)) OR
	(1 = 1)
	)
	AND  --Filter on date range
	(
	(1 = 1 AND Batch.Entry >= ISNULL(NULL, '1/1/1900') AND Batch.Entry < 
    DATEADD(d,1,ISNULL(NULL,'1/1/3000'))) OR
	(1 <> 1 AND PaymentMethod.DepositDate >= ISNULL(NULL, '1/1/1900') AND PaymentMethod.DepositDate <                 
	DATEADD(d,1,ISNULL(NULL,'1/1/3000')))
	)
	AND  --Filter on procedures
	(
	(NULL IS NOT NULL AND PatientVisitProcs.ProceduresId IN (NULL)) OR
	(NULL IS NULL)
	) 
	AND  --Filter on Insurance Carrier
	(
	(NULL IS NOT NULL AND CASE WHEN 1 = 1 THEN PatientVisit.PrimaryInsuranceCarriersID ELSE VisitTransactions.InsuranceCarriersID END IN (NULL)) 	OR
	(NULL IS NULL)
	)
	
GROUP BY
	Batch.Entry,
	PatientProfile.Last,
	PatientProfile.First,
	Guarantor.Prefix,
	Guarantor.First,
	Guarantor.Middle,
	Guarantor.Last,
	Guarantor.Suffix,
	MedLists.Description,
	ISNULL(vo.Description, 'No Owner'),
	PatientVisit.TicketNumber,
	PatientVisitProcs.DateOfServiceFrom,
	Transactions.Note

ORDER BY PatientProfile.[Last] + ', ' + PatientProfile.[First], PatientVisitProcs.DateOfServiceFrom

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