Weaverbird's Clean Up Mesh first

unhandled

#1
  1. WbProcessingException: Two consecutive edges, 1 and 0, have the same value,2, in face 48. This topology is invalid. Try using Weaverbird’s Clean Up Mesh first. - Weaverbird was unable to produce a valid result because of this.

i recieve this message, when i try to connect a mesh into weaverbird, to find the final mesh,
but i dont know :what is precies " weaverbird clean up mesh " ? a plugin>?
a part of weaverbird ? ( clean up mesh ?)
help
Thanks ( i put here the file .Uploading: Dog.gh…

gha)