Problème to export my songs

Hello (i’m french so sorry for the mistakes)
I have a very big problem with my audacity’s files. I have made and exported (and published) many songs with my PC without any problem. But for two days, i can’t export any song! the old songs that i’ve export long time ago can’t be exported to! The message that i see when i want export my song (while I ask “Export the selection”) is :" Erreur d’écriture du fichier WAV (Microsoft) (disc plein?). Information Libsndfile " (in french). Can anybody help me? Thank you (there’s 14 songs who could be saved !!)

See here:

L’info de Steve a-t-elle été utile ?