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[EP-tech] Dataset archive has no field: year

I have a damaged project built on eprints software. The administrator who previously managed it has made an update from version 3.0.7 to 3.1.3. After this update, an error occurs when you try to execute the ./generate_views [archive] 
return:
dataset archive has no field: year
Can't call method "get_value" on unblessed reference at /home/eprints/perl_lib/EPrints/DataObj.pm line 404.

./generate_abstracts [archive]
return:
Writing abstracts
dataset eprint has no field: year
Can't call method "get_value" on unblessed reference at /home/eprints/perl_lib/EPrints/DataObj.pm line 404.

How can I solve this? Thanks in advance.