Hello,
by any chance, have you exported that content from one Alfresco and imported it into another? Does the specific node have the aspect ml:document associated in the Alfresco instance where there is no error? If so, this is an result of an incomplete export / import cycle where the multilingual container has not been exported / imported along with the document. This is due to the fact that multilingual containers are global objects and are not exported when exporting partial content structures.
Regards
Axel