Object variable or with block variable not set -VBA

Option Explicit
 
Dim TextBox1 As TextBox
Dim TextBox2 As TextBox
Dim TextBox3 As TextBox
Dim TextBox4 As TextBox
Dim TextBox5 As TextBox
Dim TextBox6 As TextBox
Dim TextBox7 As TextBox
Dim TextBox8 As TextBox
Dim TextBox9 As TextBox
Dim TextBox10 As TextBox
Dim TextBox11 As TextBox
Dim TextBox12 As TextBox
Dim TextBox13 As TextBox
Dim TextBox14 As TextBox
Dim TextBox15 As TextBox
Dim TextBox16 As TextBox
Dim TextBox17 As TextBox
Dim TextBox18 As TextBox
Private Sub Command1_Click()

TextBox10.Text = Val(TextBox1) * 1.26 * 1.5 * Val(TextBox5)
TextBox11.Text = Val(TextBox3) * 1.26 * 1.5 * Val(TextBox6)
TextBox12.Text = Val(TextBox6) * 2.31 * 192
TextBox13.Text = Val(TextBox5) * 2.31 * 192 * Val(TextBox9)
 
TextBox15.Text = Val(TextBox4) * 1.26 * 1.5
TextBox14.Text = Val(TextBox1) + Val(TextBox18) + Val(TextBox13)
TextBox16.Text = Val(TextBox10) + Val(TextBox11) + Val(TextBox14) + Val(TextBox15)
 
End Sub