So finally the error is gone.
I added this environment variable to my Openshift proyect:
LD_PRELOAD = '/opt/app/node_modules/sharp/vendor/lib/libz.so'
This is the url to sharp inside my node_modules.
When I opened the terminal I get and error saying that it can't be preloaded but after installing all dependencies the error is gone, and I could upload images!!!
Thank you very much @PitaJ !!!!