Requirements import not working

[Loud]

Hello,

I am trying to import new requirements with an Excel file. However, it doesn't work. The import popup message never stops waiting, and I get an error "An error occurred while processing.", with a 405 error code "Method not allowed". When I check the server logs, I get the error "Unable to find org.squashtest.tm.domain.requirement.Requirement with id xxx".

Do you have any idea how I could fix this?