Custom Table: Unable to refresh

Hi I have this function for making summary table from 2 other tables which are data sources (Archive is excel export from SharePoint) and CAS TASKS are sharepoint items from list

Result = 

VAR calendar_date =
    CALENDAR (
        CALCULATE ( FIRSTDATE (Archive[Received Date]), Archive[Categories] = "Agreements" ),
        CALCULATE ( LASTDATE('CAS Tasks'[EndTime]), 'CAS Tasks'[Category] = "Agreements" ))
		//^^ this part takes first and last relevant date 
    
VAR filted =
    FILTER ( ALL ( 'CAS Tasks' ), [Category] = "Agreements" )  //First variable to establish data from CAS Table
VAR filted2=
	FILTER(ALL('Archive'),[Categories] = "Agreements")  //Second variable to establish data from Archive
RETURN                   //Returning data into new table
    ADDCOLUMNS (
        calendar_date,
        "Total", (SUMX (
            FILTER (
                ADDCOLUMNS (
                    filted,
                    "Exist", CONTAINS (
                        SELECTCOLUMNS ( CALENDAR ( [Received Date], 'CAS Tasks'[EndTime] ), "CheckDate", [Date] ),
                        [CheckDate], [Date]
                    )
                ),
                [Exist] = TRUE ()
            ),
            'CAS Tasks'[To process corr.]  // Hopefully addition to "TOTAL" from archive and SP data
    ))+
 (
    SUMX (
        FILTER (
            ADDCOLUMNS (
                filted2,
                "Exist2", CONTAINS (
                    SELECTCOLUMNS ( CALENDAR ( [Received Date], [End Time] ), "CheckDate2", [Date] ),
                    [CheckDate2], [Date]
                )
            ),
            [Exist2] = TRUE ()
        ),
        Archive[To process corr.]
    )
)
        )

And I gets this error message when I try to refresh. I am sure that the calendar starting date is no lower than the end date. Anyone has an idea where should I look?

Error message