Update of SAP Web IDE projects failed; see long text

What causes this issue?

An error occurred in the update of the SAP Web IDE projects. This error
appears as a warning in the following lines. One possible cause of the
error is missing OAuth2 communication from ABAP to XSA in the client
&v2&.
Das Objekt kann in XSA nur gel?scht werden, wenn die Kommunikation
korrekt konfiguriert ist.

How to fix this error?

First check the communication from ABAP to XSA and then update the SAP
Web IDE projects manually.
Proceed as follows:
Log on to the ABAP system in the client that was configured for
developing HDI objects.
Start the transaction SCTS_HTA_TOOLS (<LS>Transactions and Utility
Programs for SAP HANA Transport for ABAP</>), and choose the link <LS>
Test HDI Configuration</> under <LS>HTA for HDI -> Configuration in
Development System</>. This starts a program that tests the HDI
configuration.
If the test produces errors, long texts are available that help you to
remove these errors.
If the test does not produce any errors, choose <LS>Back</> to go back
to transaction SCTS_HTA_TOOLS.
Under <LS>HTA for HDI -> Troubleshooting Tools</>, select the link <LS>
Run Administrative Tasks in HTA for HDI</>.
Choose the action <LS>Update references in projects of SAP Web IDE</>,
enter the HDI container &v1& and choose <LS>Execute</>.
If the update does not work here either, analyze the error message and
check whether the problem is a know issue in Guided Answer <LS>
Troubleshooting HTA for HDI</> in SAP Support Portal under
https://ga.support.sap.com/dtp/viewer/#/tree/2311/actions/30100.
Fnhren Sie das Programm SCTS_HTA_CHECK_CONFIGURATION mit der Transaktion
SA38 im Mandant 000 aus.
Wenn Sie einen Fehler in Schritt Test: 'Configuring the Communication
from ABAP to XSA' erhalten, lesen Sie den Langtext, und wenden Sie sich
an die Systemadministration.
Bitten Sie die Systemadministration, die Konfiguration durchzufnhren wie
in Kapitel <LS>Configuring the Communication from ABAP to XSA</> des
Konfigurationsleitfadens <LS>Configure your ABAP Development System for
Development of HDI Objects</> beschrieben. Den Link zum
Konfigurationsleitfaden finden Sie in SAP-Hinweis 2569651
(https://launchpad.support.sap.com/#/notes/2569651).

Error message extract from SAP system. Copyright SAP SE.