Error: Could not add event '0' from feed XX - incompatible manifest.json file?

We are successfully generating our feeds using feed-generate.py but when we add them to a different MISP instance, the following message is presented on debug logs:

==> error.log <==
2019-12-30 17:46:11 Error: Could not add event '0' from feed XX.
[InvalidArgumentException] Given event UUID '0' is invalid.
Stack Trace:
#0 /var/www/MISP/app/Model/Feed.php(710): Feed->downloadAndParseEventFromFeed(Array, 0, Object(HttpSo
cket))
#1 /var/www/MISP/app/Model/Feed.php(412): Feed->__addEventFromFeed(Object(HttpSocket), Array, 0, Arra
y, Array)
#2 /var/www/MISP/app/Model/Feed.php(787): Feed->downloadFromFeed(Array, Array, Object(HttpSocket), Ar
ray, '59652')
#3 /var/www/MISP/app/Console/Command/ServerShell.php(196): Feed->downloadFromFeedInitiator('69', Arra
y, '59652')
#4 /var/www/MISP/app/Console/Command/AppShell.php(32): ServerShell->fetchFeed()
#5 /var/www/MISP/app/Vendor/kamisama/php-resque-ex/lib/Resque/Job.php(199): AppShell->perform()
#6 /var/www/MISP/app/Vendor/kamisama/php-resque-ex/lib/Resque/Worker.php(278): Resque_Job->perform()
#7 /var/www/MISP/app/Vendor/kamisama/php-resque-ex/lib/Resque/Worker.php(241): Resque_Worker->perform(Object(Resque_Job))
#8 /var/www/MISP/app/Vendor/kamisama/php-resque-ex/bin/resque(109): Resque_Worker->work('5')
#9 /var/www/MISP/app/Vendor/kamisama/php-resque-ex/bin/resque(100): startWorker('default', 1, Object(MonologInit\MonologInit), '5')
#10 {main}

The only file downloaded is the manifest.json and its JSON structure is correct. I can't see in it any UUID as '0', our org UUID is correct.

Could this be that the manifest.json file generated by feed-generate.py is incompatible with the latest version of MISP?

Snippet of a generated manifest.json file:

[{
	"5e04405b-20f4-4f12-a6ba-0af3ac110002": {
		"Orgc": {
			"uuid": "5df12de7-b018-4f25-ac49-04bdac110002",
			"name": "My ORG"
		},
		"Tag": [{
			"name": "dga",
			"colour": "#fbff30"
		}, {
			"name": "tlp:amber",
			"colour": "#FFC000"
		}, {
			"name": "admiralty-scale:source-reliability=\"b\"",
			"colour": "#075200"
		}, {
			"name": "admiralty-scale:information-credibility=\"1\"",
			"colour": "#0eb100"
		}, {
			"name": "misp-galaxy:botnet=\"Bamital\"",
			"colour": "#0088cc"
		}],
		"info": "Active DGA for Bamital",
		"date": "2019-12-26",
		"analysis": 1,
		"threat_level_id": 1,
		"timestamp": 1577336925
	},
	"5e04405d-af64-4215-828c-0af3ac110002": {
		"Orgc": {
			"uuid": "5df12de7-b018-4f25-ac49-04bdac110002",
			"name": "My ORG"
		},
		"Tag": [{
			"name": "dga",
			"colour": "#fbff30"
		}, {
			"name": "tlp:amber",
			"colour": "#FFC000"
		}, {
			"name": "admiralty-scale:source-reliability=\"b\"",
			"colour": "#075200"
		}, {
			"name": "admiralty-scale:information-credibility=\"1\"",
			"colour": "#0eb100"
		}, {
			"name": "misp-galaxy:botnet=\"Bamital\"",
			"colour": "#0088cc"
		}],
		"info": "Active DGA for Bamital",
		"date": "2019-12-25",
		"analysis": 1,
		"threat_level_id": 1,
		"timestamp": 1577336927
	},
	"5e044060-5090-48af-a0d7-0af3ac110002": {
		"Orgc": {
			"uuid": "5df12de7-b018-4f25-ac49-04bdac110002",
			"name": "My ORG"
		},
		"Tag": [{
			"name": "dga",
			"colour": "#fbff30"
		}, {
			"name": "tlp:amber",
			"colour": "#FFC000"
		}, {
			"name": "admiralty-scale:source-reliability=\"b\"",
			"colour": "#075200"
		}, {
			"name": "admiralty-scale:information-credibility=\"1\"",
			"colour": "#0eb100"
		}, {
			"name": "misp-galaxy:botnet=\"Bamital\"",
			"colour": "#0088cc"
		}],
		"info": "Active DGA for Bamital",
		"date": "2019-12-26",
		"analysis": 1,
		"threat_level_id": 1,
		"timestamp": 1577336930
	},
	"5e044062-b804-4ac4-9df4-0eb6ac110002": {
		"Orgc": {
			"uuid": "5df12de7-b018-4f25-ac49-04bdac110002",
			"name": "My ORG"
		},
		"Tag": [{
			"name": "dga",
			"colour": "#fbff30"
		}, {
			"name": "tlp:amber",
			"colour": "#FFC000"
		}, {
			"name": "admiralty-scale:source-reliability=\"b\"",
			"colour": "#075200"
		}, {
			"name": "admiralty-scale:information-credibility=\"1\"",
			"colour": "#0eb100"
		}, {
			"name": "misp-galaxy:botnet=\"Bamital\"",
			"colour": "#0088cc"
		}],
		"info": "Active DGA for Bamital",
		"date": "2019-12-27",
		"analysis": 1,
		"threat_level_id": 1,
		"timestamp": 1577336932
	}
}]

Thank you!