In the case of simple errors (incomplete or wrong import), the error message can be switched off with the [Ignore] alert button for the current PDF document.
If a PDF document still can not be successfully loaded, try to load, if possible, only single pages of that PDF, in order to locate the errors or incompatabilities.
If you are still unable to successfully load a PDF into Calamus, you can help yourself and the advancement of Calipso 3 by sending to us the appropriate PDF at the email address calipso@calamus.net. If possible, please make sure that any such PDF does not exceed a file size of 4 MB!