[sql] SQL Server - An expression of non-boolean type specified in a context where a condition is expected, near 'RETURN'

Getting this error with the following query in SQL Server 2012.

An expression of non-boolean type specified in a context where a condition is expected, near 'RETURN'.

CREATE FUNCTION [dbo].[GetPMResources](@UserResourceNo nvarchar(250))

   RETURNS @Resources TABLE (
   ResourceNo nvarchar(250) COLLATE Latin1_General_CS_AS not null,
   Name nvarchar(250) COLLATE Latin1_General_CS_AS not null
   ) 
  AS
  BEGIN

        Declare @RoleID int, @UserDivision nvarchar(20)
        SELECT TOP(1) @RoleID = r.ReportingRole, @UserDivision = r.DivisionCode
        FROM Resource r 
        WHERE r.ResourceNo = @UserResourceNo



        INSERT @Resources
        SELECT r.ResourceNo,Name = r.ResourceNo + ' ' + r.Name
        FROM Resource r WHERE r.ResourceNo IN
                        ( 
                            SELECT m.ResourceNo FROM JobMember m
                            JOIN Job j ON j.JobNo = m.JobNo
                            WHERE j.ProjectManagerNo = @UserResourceNo 
                            OR
                            j.AlternateProjectManagerNo = @UserResourceNo
                        ) 
                        OR
                        (
                            SELECT m.ResourceNo FROM JobMember m
                            JOIN JobTask t ON t.JobTaskNo = m.JobTaskNo
                            WHERE t.TaskManagerNo = @UserResourceNo
                            OR
                            t.AlternateTaskManagerNo = @UserResourceNo
                        )                   
        RETURN 
  END

YOu can also rewrite it like this

FROM Resource r WHERE r.ResourceNo IN
        ( 
            SELECT m.ResourceNo FROM JobMember m
            JOIN Job j ON j.JobNo = m.JobNo
            WHERE j.ProjectManagerNo = @UserResourceNo 
            OR
            j.AlternateProjectManagerNo = @UserResourceNo

            Union All

            SELECT m.ResourceNo FROM JobMember m
            JOIN JobTask t ON t.JobTaskNo = m.JobTaskNo
            WHERE t.TaskManagerNo = @UserResourceNo
            OR
            t.AlternateTaskManagerNo = @UserResourceNo

        )

Also a return table is expected in your RETURN statement

Your problem might be here:

OR
                        (
                            SELECT m.ResourceNo FROM JobMember m
                            JOIN JobTask t ON t.JobTaskNo = m.JobTaskNo
                            WHERE t.TaskManagerNo = @UserResourceNo
                            OR
                            t.AlternateTaskManagerNo = @UserResourceNo
                        )

try changing to

OR r.ResourceNo IN
                        (
                            SELECT m.ResourceNo FROM JobMember m
                            JOIN JobTask t ON t.JobTaskNo = m.JobTaskNo
                            WHERE t.TaskManagerNo = @UserResourceNo
                            OR
                            t.AlternateTaskManagerNo = @UserResourceNo
                        )

An expression of non-boolean type specified in a context where a condition is expected

I also got this error when I forgot to add ON condition when specifying my join clause.