Reference to type 'PXBqlTable' and 'IBqlTableSystemDataStorage' claims it is defined in 'PX.Data', but it could not be found    customization package

I trying to create a new Action on the Appointment screen. when I add the following code it to the graph extension it gives following error messages. But i have add the dll references to the project.
Reference to type 'PXBqlTable' claims it is defined in 'PX.Data', but it could not be found   customization package

Reference to type 'IBqlTableSystemDataStorage' claims it is defined in 'PX.Data', but it could not be found   customization package

        public PXAction<FSAppointment> CreateMRN;
        [PXProcessButton]
        [PXUIField(DisplayName = "Assign", Enabled = false)]
        protected virtual IEnumerable createMRN(PXAdapter adapter)
        {
            bool isMassProcess = adapter.MassProcess;

            Base.Save.Press();

            PXLongOperation.StartOperation(this, delegate ()
            {

            });

            return null;
        }

when I am investigating the issue, changed the DAC name to FSAppoinment to ARInvoice then it works.

I delete the PX.Data.dll from the bin and updated the website. but still unable to fix the issue