Runtime 440 error when opening a UserForm

I made a column navigator userform a few weeks ago, and it's been working great. I have it saved in my Personal, and open it when I have a big workbook to navigate. Today it won't open, just gives me RunTime 440 Automation Error. I've attached the form and the code in the attached workbook. it's now working in the attachment, but not working from my Personal. I'd appreciate any help I could get in finding why it won't work today.