windows app crash when thread runing

Problem signature:
  Problem Event Name:   CLR20r3
  Problem Signature 01: windowsformsapplication1.exe
  Problem Signature 02: 1.0.0.0
  Problem Signature 03: 5492cce7
  Problem Signature 04: System
  Problem Signature 05: 4.0.30319.18408
  Problem Signature 06: 52311185
  Problem Signature 07: 21b0
  Problem Signature 08: 61
  Problem Signature 09: OpenQA.Selenium.WebDriver
  OS Version:   6.1.7601.2.1.0.256.48
  Locale ID:    13313
  Additional Information 1: de12
  Additional Information 2: de12fc8c1264863afd2c5db80a9c81b6
  Additional Information 3: f0ae
  Additional Information 4: f0aea4b779e3a436efe3c90f3c65a4f2

Invoke(new Action(() =>
            {
                progressBar1.Visible = false;
                button1.Enabled = true;
                btnloadnumbers.Visible = true;
                txtSearch.Enabled = true;
                btnloadnumbers.Enabled = true;

            }));