Got Error on "Could not load type"

[awan.soekamto]

Hi,
I am newbie using Spire.Presentation 5.7.2 and Spire.PDF 6.7.6.
The PDF is working (I use it for watermarking), but when I call this:

Dim _slideParser As New Spire.Presentation.Presentation()

I got:
Could not load type 'spr㙪' from assembly 'Spire.Pdf, Version=6.7.6.0, Culture=neutral, PublicKeyToken=663f351905198cb3'

Not sure what happened. All dlls already in the correct version.
Any help will be appreciated.
Thanks.

[Elena.Zhang]

Hello,

Thanks for your inquiry.
Kindly note that our Spire.Presentation and Spire.PDF are not compatible. If you want to use them in the same project, you need to install our Spire.Office. If there are any questions, just feel free to write back.

Sincerely
Elena
E-iceblue support team