docmd.openform Invalid database object reference

I have a problem and I hope you will agree to help me.

After modifying database links (front end to new backend),
one form does not open and generated reference error 3276.

I open the form by clicking on tree control node.
but It does not open directly from DB window.

but, If I compact & Repair the file it opens correctly.

What should I do in order to ovoid this error ?

Private Sub menuTree_Click()
Dim strcrit As String
stricrit = menuTree.SelectedItem.Key
DoCmd.OpenForm stricrit End Sub

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Invalid database object reference.
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"Run-time error '3276': Invalid database object reference."

Below is my code. I have checked my tables, they are all fine. I haven't run into this error before and don't really know where to start. Thanks in advance.

Dim vQueryName As String
DoCmd.SetWarnings False
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Private Sub Login_Click()
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Im relatively new to Access but have some background in VBA programming.

Currently im dealing with a relatively large Database (Access File size currently at 1GB) wich of course makes computations very slow.

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It opens up a dialog box.

DoCmd.OpenForm (frmActionUser,acNormal,,,acFormReadOnly,acDialog,)

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Here is my code:

Dim Var1 As Integer

If Me.txtPassword.Value <> DLookup("Password", "Analysts", _
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Code Correction :|
If Me.PASS.Value = Nz(DLookup("Password", "tblEmployees", "[Employee]=" & Chr(34) & Me.EMP.Value & Chr(34)), vbNullString) Then
gstrUserName = Me.EMP.Value
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Countabc = Countabc + 1
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MsgBox "Password Invalid. Please Try Again", vbOKOnly, "Invalid Entry!"
End If
End If

I actually wanna close the appilcation if the passwrod is incorrect for 3 times.
Please advise if the above code is incorrect

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Set rs = Nothing