I am having the same issue when I try to bulk import a PDF with the "Error Occured" box popping up.  It looks like you have made some updates and released a new version, correct?  I purchased this module (version 5.00.02) off of SnowCovered.  What do I need to do to get access to the new version of this module?
I looked into the issue further regarding the "Error Ocurred" message that pops up after trying to import a PDF and below you will find the error information. Any ideas on how to fix this?  When uploading a PDF it says that it has been uploaded, displays the error message, and then if you go to Page Management, nothing shows up.
System.Runtime.Serialization.SerializationException
Message: Type 'MagickNet.MagickError' in Assembly 'MagickNet, Version=1.0.0.3, Culture=neutral, PublicKeyToken=null' is not marked as serializable.
 
Hi,
Please, can you tell me what's your DNN version ? Can you give me all details about your issue ? You would find them in DNN event viewer or Windows event viewer.
Best Regards,