BC365:error when designing page (on-Premise install)

wic

hi,
I'm stuck on an BC365 Wave 2 (15) environment. My SQL is on Azure, my Administration Tier is on an Azure VM.
BC works fine. The database is a Migrated one (NAV16 ->BC13 and now BC15)
In the webclient, on any pages, in Designer mode, as soon as I drop a field, error is raising "something went wrong".

The EventLog of the server says:

• Category: DatabaseSync: Message (NullReferenceException): RootException: NullReferenceException
  
• Object reference not set to an instance of an object.
• Category:Extensions: Message: same as above
• Category : Development: Message: Message Failed to save the extension. Object reference not set to an instance of an object.
  
• Category: Extensions : Message (NavDesignerExtensionStorageException): RootException: NavDesignerExtensionStorageException
• Category: Extensions: Message The execution of the code block at HandleAddPageFieldAction had one or more unhandled exceptions., Additional info: NSDesigner

and some more ..
EventLogWriter
Unhandled error occurred on a browser or device client:
{
"clientInfo": {
"platform": "Win32",
"userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0",
"browserLanguage": "fr"
},
"message": "TypeError: $0.setCurrenRow is not a function",
"pageUrl": "https://theurlofmyBVinstance",
"originalError": {},
"location": {
"name": "https://theurlofmybcinstance/js/framework.js?h=888D73829F5FCAB0537812DF9B7F596A9042E25F67D6044B18BC0A82AD2723A3&_v=15.0.36510.0",
"url": "https://theurlofmyBCinstance/js/framework.js?h=888D73829F5FCAB0537812DF9B7F596A9042E25F67D6044B18BC0A82AD2723A3&_v=15.0.36510.0",
"lineNumber": 913,
"columnNumber": 55
},
"detailedMessage": "whenNotBusy/</

...then it lose the connection.
I hardly think it is linked to the following: I can't install the "Designer" Extension

When I try to install the "Designer_xyz V1.0.0.0" extension I got "Exception thrown during implicit sync of extension Designer_bca51682-0620-4803-bbd1-cde41742a9dd by default::myname : Object reference not set to an instance of an object."

How can I get it works? thanx volks, see you in Antwerpen.
Chris

wic

Disappointed:
I found the graal: deactivate flag on NST "Enable Deadlock Monitoring" as the view MUST be deleted when mounting DB on AzureSQL.
Thanks to MS to NOT describe this in the paper about the "remove view Deadlock Analyszer Monitor"!

wic

Disappointed:
I found the graal: deactivate flag on NST "Enable Deadlock Monitoring" as the view MUST be deleted when mounting DB on AzureSQL.
Thanks to MS to NOT describe this in the paper about the "remove view Deadlock Analyszer Monitor"!