Run-time error 402 for Userform

I have the userform with a textbox on it. I want to validate for the presence of several characters and phrases (placed them in an array). It is generating an error "Run-time error 402. Must close or hide topmost modal form first". I need to hide userform2 when I display back userform1. Any suggestions how to change the code?

Code:

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Private Sub CommandButton1_Click()

            Dim ArrayCh As Variant
           
            ArrayCh = Array("etc", "<", "%", ">", ";", "[", "]")
           
            For i = LBound(ArrayCh) To UBound(ArrayCh)
                If InStr(1, UserForm2.TextBox1.Text, ArrayCh(i), vbTextCompare) > 0 Then
                    MsgBox "The word/phrase/character " & ArrayCh(i) & " is not allowed in the title"
                Else
                    UserForm1.txtTI1.Text = UserForm2.TextBox1.Text
                    UserForm2.Hide
                End If
            Next i
End Sub

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Code:

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Private Sub CommandButton1_Click()
   
    Dim ArrayCh As Variant
   
    ArrayCh = Array("<", "%", ">", ";", "[", "]")
   
    For i = LBound(ArrayCh) To UBound(ArrayCh)
        If InStr(1, Me.TextBox1.Text, ArrayCh(i), vbTextCompare) > 0 Then
            MsgBox "The characters <, %, >, ;, [, and ] are not allowed in the title"
            Exit Sub
        End If
    Next i
   
    If InStr(1, LCase(Me.TextBox1.Text), "etc", vbTextCompare) > 0 Then
        MsgBox "The word etc is not allowed in the title"
    End If
   
    Unload Me
    UserForm1.txtTI1.Text = UserForm2.TextBox1.Text
E

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Why using a msgbox in a userform ?
The userform is the best tool to inform users.

Why using a second userform if a userform offers multipages, frames, tabstrips, etc. ?

Wow that was sweet Sam! I will take note of your advice snb

I'm with snb.

Di you notice the omission in that code?