accelerator connection problem

Hello,
 
I've followed the installation https://www.flexmonster.com/doc/getting-started-with-accelerator-ssas/ to connect to a local ssas database on sql server 2019
The flexmonster accelerator configuration file is 
CONNECTION_STRING=Data Source=L-PLOYER\KSSAS
PORT=50005
HTTPS=false
CACHE_MEMORY_LIMIT=0
CACHE_ENABLED=true
GZIP=true
ALLOW_ORIGIN=*
WINDOWS_AUTH=false
The definition of the pivot is 
var pivot = new Flexmonster({
container: "#pivotContainer",
toolbar: true,
report: {
dataSource: {
type: "microsoft analysis services",
/* URL to Flexmonster Accelerator */
proxyUrl: "http://localhost:50005",
/* Catalog name */
catalog: "AWDW2019Multidimensional-SE",

/* Cube name */
cube: "Adventure Works",

// Flag to use the Accelerator instead of XMLA protocol binary
binary: true
}
}
});
The server is running as shown in flexmonster acc.png
 
But I get the following error on the screen:
ERROR  Unauthorized. 
and this message in the javascript console "Failed to load resource: the server responded with a status of 401 (Unauthorized)" http://localhost:50005/FlexmonsterProxy/Handshaking