Desktop Preview shows error

My App-ID: 5BDF0E64-9F03-6F8E-FF75-0E183AF61100
When starting the desktop preview from UI Builder, I’m getting the following error message in the browser:

Backendless encountered an error while handling the request. An internal trouble ticket with ID 47129750-436F-E3EE-FFD3-68C8B0637B00 has been created and we will be investigating the issue.
org.apache.http.conn.ConnectTimeoutException: Connect to bl-billing:8080 [bl-billing/10.43.34.66] failed: connect timed out
java.lang.RuntimeException: org.apache.http.conn.ConnectTimeoutException: Connect to bl-billing:8080 [bl-billing/10.43.34.66] failed: connect timed out
	at com.backendless.services.billing.BillingInteractor.getSubscriptionStatus(BillingInteractor.java:652)
	at com.backendless.services.billing.BillingInteractorCacheDecorator.getSubscriptionStatus(BillingInteractorCacheDecorator.java:183)
	at com.backendless.util.FileRequestHelper.getResponseForFileViewOrDownloadByClient(FileRequestHelper.java:95)
	at controllers.FilesApiController.lambda$downloadFile$11(FilesApiController.java:508)
	at com.backendless.util.FileRequestHelper.validateHostAndReturnResult(FileRequestHelper.java:178)
	at controllers.FilesApiController.downloadFile(FilesApiController.java:504)
	at controllers.FilesApiController.downloadFileOrExecuteScript(FilesApiController.java:499)
	at controllers.FilesApiController.lambda$action$10(FilesApiController.java:468)
	at com.backendless.async.BackendlessExecutorService.lambda$submit$0(BackendlessExecutorService.java:106)
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to bl-billing:8080 [bl-billing/10.43.34.66] failed: connect timed out
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:151)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376)
	at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
	at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
	at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
	at org.apache.http.client.fluent.Request.internalExecute(Request.java:173)
	at org.apache.http.client.fluent.Executor.execute(Executor.java:262)
	at com.backendless.services.billing.BillingInteractor.getSubscriptionStatus(BillingInteractor.java:647)
	... 12 more
Caused by: java.net.SocketTimeoutException: connect timed out
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.base/java.net.Socket.connect(Socket.java:609)
	at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
	... 24 more

Seems to work again …
Regards