No suitable method found to override

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C#

How to fix this problem?

Error 2 'School_Software.RptStudents.NewGenerator': no suitable method found to override C:\Users\user\Downloads\Compressed\school_software_0\School Software\School Software\RptStudents.cs 33 31 School Software

Below is Code

namespace School_Software {
   
    
    
    public class RptFinalMarksLedger : ReportClass {
        
        public RptFinalMarksLedger() {
        }
        
        public override string ResourceName {
            get {
                return "RptFinalMarksLedger.rpt";
            }
            set {
                // Do nothing
            }
        }
        
        public override bool NewGenerator {
            get {
                return true;
            }
            set {
                // Do nothing
            }
        }
        
        public override string FullResourceName {
            get {
                return "School_Software.RptFinalMarksLedger.rpt";
            }
            set {
                // Do nothing
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public CrystalDecisions.CrystalReports.Engine.Section Section1 {
            get {
                return this.ReportDefinition.Sections[0];
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public CrystalDecisions.CrystalReports.Engine.Section Section2 {
            get {
                return this.ReportDefinition.Sections[1];
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public CrystalDecisions.CrystalReports.Engine.Section Section3 {
            get {
                return this.ReportDefinition.Sections[2];
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public CrystalDecisions.CrystalReports.Engine.Section Section4 {
            get {
                return this.ReportDefinition.Sections[3];
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public CrystalDecisions.CrystalReports.Engine.Section Section5 {
            get {
                return this.ReportDefinition.Sections[4];
            }
        }
    }
    
    [System.Drawing.ToolboxBitmapAttribute(typeof(CrystalDecisions.Shared.ExportOptions), "report.bmp")]
    public class CachedRptFinalMarksLedger : Component, ICachedReport {
        
        public CachedRptFinalMarksLedger() {
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public virtual bool IsCacheable {
            get {
                return true;
            }
            set {
                // 
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public virtual bool ShareDBLogonInfo {
            get {
                return false;
            }
            set {
                // 
            }
        }
        
        [Browsable(false)]
        [DesignerSerializationVisibilityAttribute(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
        public virtual System.TimeSpan CacheTimeOut {
            get {
                return CachedReportConstants.DEFAULT_TIMEOUT;
            }
            set {
                // 
            }
        }
        
        public virtual CrystalDecisions.CrystalReports.Engine.ReportDocument CreateReport() {
            RptFinalMarksLedger rpt = new RptFinalMarksLedger();
            rpt.Site = this.Site;
            return rpt;
        }
        
        public virtual string GetCustomizedCacheKey(RequestContext request) {
            String key = null;
            
            return key;
        }
    }
}

What I have tried:

public class RptFinalMarksLedger : ReportClass 

Tried to put partial like this below

public partial class RptFinalMarksLedger : ReportClass 

not working