i get errors about a failure in encoding something into B2-format

This is a line from the log

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 [498] Protocol error - Message Id: U33Y6MQ4H8VJ Offset: -1 Failure to encode B2 format...
2013-09-30 08:43:10 *** Paclink 4.3.4.0 ready..

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I try to send a with attachments, and then i get this. I am in the list of people with up-to-date software.

my winlink email adress is pa3bas@winlink.org or other email pa3bas@xs4all.nl

Please contact me if you need more information

Thank you,

Bastiaan PA3BAS