I just updated Liana v6 today.
It seems I’ve got problems when I create (or edit) an entry that contains dropdowns and selects (autocomplete). I can’t fill my form.
Error when I open the form:
Error when I click on a date input:
Error when I click on a select:

It concerns the collection Fundings and my project is lereacteur-admin.
I use:
"database_type": "MongoDB",
"liana": "forest-express-mongoose",
"liana_version": "6.3.9",
"engine": "nodejs",
"engine_version": "10.16.3",
"framework": "other",
"framework_version": null,
"orm_version": "5.8.13"
Hi @XavierColombel,
I guess you followed the documentation on upgrading, do you have any logs on your liana ?
Can you compare your previous forestadmin-schema.json with the new one ?
Here is my schema update:
And yes I’ve upgraded before with 6.3.5.
Inspecting the source, I’ve got this:

t = undefined
That’s weird 
Can you try to clean your cache ?
If it doesn’t work, can you check where this method is called ?
On which environment do you have this issue ?
I’ve got errors on both : dev and prod
On you first screen click on the line that start with at a.value just after the at addQueryTimezone and put a breakpoint there.
Is this.get('field.referenceModel') returning something ?
Is this what you’re looking for ?
No before on the a.value. You should see a line that looks like: this.addQueryTimezone(this.get('field.referenceModel.rendering.environment'));
Okey perfect
! now in there, can you send me the value of field.referenceModel and field 
field.referenceModel is null
field is a loooong object, which key would you like? 
Copy paste the entire object please
or do a toJSON() on it 
field value :
{
"fieldName": "facture",
"displayName": "Facture",
"description": null,
"isReadOnly": true,
"isFilterable": false,
"widgetEdit": {
"name": "belongsto dropdown",
"parameters": {}
},
"widgetDisplay": {
"name": "text",
"parameters": {}
},
"mappingValues": [],
"conditionalFormatting": null
}
Hi @XavierColombel
what i can seen on your project, the field facture doesn’t have any reference. I don’t really understand how can you set a BelongsTo select widget.
I think you can fix your issue by select another widget in field settings.
Let me know if it’s help.