Access - Excepción no controlada del tipo 'System.Data.OleDb.OleDbException' en System.Data.dll

Function Modificar(ByVal id As String, ByVal nombre As String, ByVal direccion As String, ByVal edad As String, ByVal telefono As String, ByVal sueldo As String, ByVal digito As String) As Boolean

    'convertir datos cadenas a numeros 

    Dim xid As Integer = Convert.ToInt32(id)

    Dim xedad As Integer = Convert.ToInt32(edad)

    Dim xsueldo As Integer = Convert.ToDouble(sueldo)

    'crear conexion

    Dim conexion As New OleDbConnection

    conexion.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source = C:\Proyecto empresa BBDD\BBDD maestra.accdb; "

    'instruccion sql

    Dim cadena_sql As String = "UPDATE personal SET" ' Modificar datos

    cadena_sql = cadena_sql + " Nombre      = '" & nombre & "',"

    cadena_sql = cadena_sql + " Direccion   = '" & direccion & "',"

    cadena_sql = cadena_sql + " edad        = '" & xedad & "',"

    cadena_sql = cadena_sql + " telefono    = '" & telefono & "',"

    cadena_sql = cadena_sql + " sueldo_base = '" & xsueldo & "',"

    cadena_sql = cadena_sql + " Digito      = " & digito & ""

    cadena_sql = cadena_sql + " WHERE id    =" & xid

    'crear comando

    Dim comando As OleDbCommand = conexion.CreateCommand()

    comando.CommandText = cadena_sql

    'ejecutar consulta de accion

    conexion.Open()

    comando.ExecuteNonQuery()

    conexion.Close()

    Return True

End Function