Error in procedure "Must declare the scalar variable"

When I run the following Procedure, SQLServer gives the error:

  

error Must declare the variable scalar "@VDIAPARALISADO".

Procedure:

BEGIN
SELECT @VDIAPARALISADO = COUNT(F.DATA)
FROM ED_FERIADO F
WHERE F.EDEMPRESA_ID = @PEDEMPRESA_ID
    AND F.GMUNICIPIO_ID = @PGMUNICIPIO_ID
    AND F.SECRETARIA_ID = @PSECRETARIA_ID
    AND F.ANO = @PANO
    AND F.TIPO IN ('6')
    AND F.DATA BETWEEN @DT_INICIO
        AND @DT_FIM
    AND F.DATA NOT IN (
        SELECT C.DATA
        FROM ED_CALENDAR C
        WHERE F.EDEMPRESA_ID = @PEDEMPRESA_ID
            AND F.GMUNICIPIO_ID = @PGMUNICIPIO_ID
            AND F.SECRETARIA_ID = @PSECRETARIA_ID
            AND F.ANO = @PANO
            AND F.DATA BETWEEN @DT_INICIO
                AND @DT_FIM
            AND C.TIPO_CALEN = @VTIPO_CALENDARIO
        )

            END