Run-time error 424 macro

I have 2 forms created for an excel 2013 spreadsheet to use for input of data. One button works, but the other gives me a "Run-time error '424': Object required" message. I have the 2 buttons on a worksheet named "CAPAR Entry". The data is input to a worksheet named "CAPAR listing". I have used the same code for both buttons other than changing the form names. Here is the code:

Sub CAPARInput()
'
'CAPAR Entry Macro
'
'Macro designed to call up a user form for gather data and
'updating the CAPAR data
'
'turn off screen updating and cell calculations for faster processing
Application.ScreenUpdating = False
Application.Calculation = xlCalculateManual


'clear and bring up sort data entry form
'bulk of the macro work is internal to sortform
Unload CAPARResponseForm
CAPARResponseForm.Show
'return to input worksheet
Sheets("CAPAR Entry").Select
'turn screen updating and autocalculations back on prior to ending macro
'does not enable calulations for sheet disabled by workbook open macro
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
End Sub

The error highlights "CAPARResponseForm.Show". My form name is "CAPARResponseForm", so I don't have a spelling error. I am a novice at vba and cannot determine why my macro doesn't work.

Re: Run-time error code 424 in button macro to open form

Thanks Robert,
I did verify the form name prior to posting, so I know that was not the cause. I tried to use your code to verify the form name, though, but I get a Run-time error '1004': Programmatic access to Visual Basic is not trusted. I did the reference update as instructed. In any case, I'll make the change to the code as you instructed, since I was wondering about that anyway. I had copied and pasted the code and updated references within the code. In any case, I had started over yesterday and was able to get both buttons to work. I was going to delete this thread but was unable to do so. I appreciate your time and have learned at least a little bit more. Every little bit helps.

Re: Run-time error 424 macro

Thanks Rory,

Once I get past the 1st error, I get another Run-time error '104': Method 'VBProject' of object'_Workbook' failed. Since I have everything I need working, this is not something I really need to fix. The error highlights the line of code:
[code]
For Each vbc In ThisWorkbook.VBProject.VBComponents
[code]

If you can tell why this may not be working, great. I'm fine to let this go and not waste anyone's time. I appreciate the time y'all put into this forum.

Re: Run-time error 424 macro

You are correct Rory. All the Macro Settings are grayed out, so I can't change it. That's one of the frustrations working in a .mil environment.

Thanks!