SQL Query Error In Defining Alias For Column

My following sql query giving me the following error, What does it mean. Am i defining the alias fir column in wring way. Please help me out with this. My error is this and i am putting query just below the error. Error in SELECT clause: expression near 'Year'. Missing FROM clause. Unable to parse query text.

SELECT [tbl_students].passing_year as Passing Year,[tbl_branch].branch_name as Branch_Name FROM [tbl_students], [tbl_course], [tbl_branch] WHERE [tbl_students].course_id=@courseId
AND [tbl_students].branch_id IN(64)
AND [tbl_students].course_id=[tbl_course].course_id AND [tbl_students].branch_id=[tbl_branch].branch_id
AND (@firstYrPercent is null OR [tbl_students].first_year_percent>=@firstYrPercent)
AND (@secondYrpercent is null OR [tbl_students].second_year_percent>=@secondYrPercent)
AND (@thirdYrPercent is null OR[tbl_students].third_year_percent>=@thirdYrPercent)
AND (@finalYearpercent is null OR [tbl_students].final_year_percent>=@finalYearpercent)
AND (@currentDegeePercentage is null OR [tbl_students].current_degree_percent>=@currentDegeePercentage)
AND (@passoutYear is null OR [tbl_students].passing_year>=@passoutYear)
AND (@currentBacklog is null OR [tbl_students].current_backlog=@currentBacklog)
AND (@sex is null OR [tbl_students].gender=@sex)
AND (@eGap is null OR [tbl_students].gapin_education<=@eGap)
AND (@highSchoolPercentge is null OR [tbl_students].highschool_percentage>=@highSchoolPercentge)
AND (@higherSchoolPercentage is null OR [tbl_students].ssc_percentage>=@higherSchoolPercentage)
AND (@grauationPercentage is null OR [tbl_students].graduation_percentage>=@grauationPercentage)
AND (@diplomaPercentage is null OR [tbl_students].diploma_percentage>=@diplomaPercentage)
AND (@noOfAtkt is null OR [tbl_students].number_of_ATKT<=@noOfAtkt)
AND (@validDate is null OR [tbl_students].DOB>=@validDate)