Error 2107 The value you entered doesn't meet the validation rule defined for the field or control

I am using the following code in a search form to create an sql to use as the recordsource for the form. It works fine except for when a Date To is selected.

Public Sub SearchForm()
	'Main body of the query
    strSQL = "SELECT Distinct tblDocs.* FROM tblDocs INNER JOIN tblDocumentContents ON tblDocs.fldDocID=tblDocumentContents.fldDocID"
    
	'Create Where conditions based on the selected search controls
    strWhere = " WHERE tblDocs.fldDocID In (Select fldDocID From tblDocs "
    strWhere = strWhere & "WHERE fldDocNameID Like " & Nz(Me.cboSearchDocuments, " '*' ") & ") "
    
    If Not IsNull(Me.cboSearchPeople) Then
    
        strWhere = strWhere & "AND tblDocs.fldDocID "
        strWhere = strWhere & "In (Select fldDocID From tblDocumentContents WHERE fldEntityID Like " & Me.cboSearchPeople & ")"
  
    End If
    
   If Not IsNull(Me.cboSearchPlaces) Then
      
    strWhere = strWhere & " AND tblDocs.fldDocID "
    strWhere = strWhere & "In (Select fldDocID From tblDocumentContents WHERE fldPlaceID Like " & Me.cboSearchPlaces & ")"
   
   End If
   
   If Not IsNull(Me.cboSearchTopics) Then
      
    strWhere = strWhere & " AND tblDocs.fldDocID "
    strWhere = strWhere & "In (Select fldDocID From tblDocumentContents WHERE fldTopicID Like " & Me.cboSearchTopics & ")"
   
   End If
   
   If Not IsNull(Me.txtDateFrom) Then
   
   strWhere = strWhere & " AND tblDocs.fldDocID "
    strWhere = strWhere & "In (Select fldDocID From tblDocs WHERE fldDate >= #" & Me.txtDateFrom & "#)"
   
   End If
   
   If Not IsNull(Me.txtDateTo) Then
   
   strWhere = strWhere & " AND tblDocs.fldDocID "
    strWhere = strWhere & "In (Select fldDocID From tblDocs WHERE fldDate <= #" & Me.txtDateTo & "#)"
   
   End If
   
   'Complete the SQL
   strSQL = strSQL & " " & strWhere
    
	'Assign strSQL to the form recordsource.
    Me.RecordSource = strSQL
    
	'Refresh form if there is no records 
    If Me.RecordsetClone.RecordCount = 0 Then
    
    MsgBox "This search produce 0 records"

    Call cmdRefresh_Click
    
    End If
End Sub

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It seems that the problem is with the codes between line 37 and 42. But the codes in these lines are almost identical to the codes in line 30-35 which works fine.