Error module update "Contact Form" 1.7.6.0

[Valentinrab]

Hi everyone,

 

I have a error with my module "contactform", I tried to update the module "contactform" (I tried to delete and reinstall but I have the same issue after).
Error message : Error!
Exception thrown by module contactform on upgrade. Failed to copy "/home/artstudc/public_html/symbiosis-skincare.com/var/cache/prod/sandbox/5ede3e61109aa/contactform/Readme.md" to "/home/artstudc/public_html/symbiosis-skincare.com/modules/contactform/Readme.md" because target file could not be opened for writing.

After this I tried to manually reinstall the module with filezilla. Same problem, impossible to delete the file "contactform" in the module file, I cannot overwrite it with a good/update file.
I searched on forums and google, but no one has the same issue.

+ in the shop parameters, I don't have the button "Contact" for configure the contact form.

Thanks in advance