[Rails] Error of DEPRECATION WARNING

Hi,

I Have a strange error when i type the command "rake db:migrate "
Can you help to solve this error or give me some advices

the error is:

DEPRECATION WARNING: Rake tasks in /home/joanne/Desktop/picto/vendor/
plugins/prawnto/tasks/prawnto_tasks.rake are deprecated. Use lib/tasks
instead. (called from <top (required)> at /home/joanne/Desktop/picto/
Rakefile:7)

thanks for help

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