"can't find project or library" error

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I want to control the data in a combo box according to start and end dates
from a calendar control.

I get a "can't find project or library" error when I try this code in this
mousedown procedure.

Private Sub db_betw_dates_obj_MouseDown(Button As Integer, Shift As
Integer,
X As Single, Y As Single)
select * from RONCHECK_access where RONCHECK_access!DATE Between
[start_date_cal.value] And [end_date_cal.value];

The rowsource property contains Combo.RowSource = strSql


Any suggestions? Thanks.