troubleshooting Question

What is wrong with this form?

Avatar of SteveL13
SteveL13Flag for United States of America asked on
Microsoft Access
3 Comments1 Solution11 ViewsLast Modified:
Earlier this week an expert helped me with a checkbox issue.  But I have turned the Main Form into a form with 7 sub-forms.  I cannot figure out why when I enter, for example, a Start Time and End Time in the Sunday subform, I get "Invalid use of null" and the times go blank.  And yet if I close and re-open the form it seems to look ok.  Can someone tell me what is wrong?

Sample file attached.Test.accdb
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