License error

Hello. I use in project QiuckPDF dll v.7.17

I'm working with an old project.
On my developer computer this program is work fine,without any problem. But on other computer I have this error:

1 14 17.01.2011 09:23:06.199362000 error StackTrace : at QuickPDFAX0717.PDFLibrary.UnlockKey(String LicenseKey) in D:\Project\QuickPDFAX0717.cs:line 4071 0x00001528 0x00000000720D0000 LogSys.Client.NET35.dll

C:\Windows\assembly\GAC_32\LogSys.Client.NET35\3.5.0.0__7c141aa4c4a60dc4 154624 17.01.2011 09.22.53.728349 Project.exe 0x00000d00  
1 15 17.01.2011 09:23:06.199367000 error at Project.PDFDocument.ReadPDF() in D:\Project\PDFDocument.cs:line 387 0x00001528 0x00000000720D0000 LogSys.Client.NET35.dll

C:\Windows\assembly\GAC_32\LogSys.Client.NET35\3.5.0.0__7c141aa4c4a60dc4 154624 17.01.2011 09.22.53.728349 Project.exe 0x00000d00

In what may be the reason? Thanks in advance.

I have tested It program on computer which have .NET and I have such error. 

Error occurs when there is a function call - UnlockKey.

This is error window - http://a.imagehost.org/0051/Error.jpg - 

And this is error line:

PDF Document.cs - 395 - int res = qp.UnlockKey(qpKey);

QuickPDFAX0717.cs - 4071  -

public int UnlockKey(string LicenseKey)
  { ........... }

I tried to keep track of what value the function returns, but does not work. In normal operation, it returns 1. I can see it in logs. But on other machines that have no relation to the draft error. 

Rowan wrote: I'm fairly confident this isn't an issue with the library, but rather some sort of configuration issue on your end. Perhaps you can confirm if you are using the DLL edition or the ActiveX edition? The DLL edition filename is "QuickPDFDLL0723.dll" and the ActiveX edition filename is "QuickPDFAX0723.dll".

Based on the file name I am using ActiveX dll - QuickPDFAX0717.dll
Could you explain the difference between them?
Thanks in advance.

Problem solved by registering ActiveX component in the system. 

Rowan

Thank you for help