VB2010 error "a first chance exception of type 'system.invalidoperationexception' occurred in system.data.dll "

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VB

Visual-Studio

Hi, I got this error in my Immediate Window when I try to debug. I am trying to insert data into a table in Microsoft Access. Also it seems that I failed to connect to database. Here is the code that I have.

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
' Check if username or password is empty
If PasswordTextBox.Text = "" Or UsernameTextBox.Text = "" Then
MessageBox.Show("Please complete the required fields..", "Authentication Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
Else
' Both fields was supply
' Check if user exist in database
' Connect to DB
Dim conn As New System.Data.OleDb.OleDbConnection()
conn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\user1\Documents\PutLock.accdb"

Try
'conn.Open()
'MsgBox("Success")

Dim sql As String = "SELECT * FROM PutLockSignUp WHERE Username='" & UsernameTextBox.Text & "' AND Password = '" & PasswordTextBox.Text & "'"
Dim sqlCom As New System.Data.OleDb.OleDbCommand(sql, conn)

'Open Database Connection
sqlCom.Connection = conn
conn.Open()

Dim sqlRead As System.Data.OleDb.OleDbDataReader = sqlCom.ExecuteReader()

If sqlRead.Read() Then
Form2.Show()
Me.Hide()

Else
' If user enter wrong username and password combination
' Throw an error message
MessageBox.Show("Username and Password do not match..", "Authentication Failure", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)

'Clear all fields
PasswordTextBox.Text = ""
UsernameTextBox.Text = ""

'Focus on Username field
UsernameTextBox.Focus()
End If

Catch ex As Exception
MessageBox.Show("Failed to connect to Database..", "Database Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try

End If
End Sub

What I have tried:

I have tried searching for solution in google but I couldnt understand some of the explanation as I am still new in VB.NET. Btw, this is my school assignment. Please help me.