What action can solve the problem of CSRF token errors?

Adding the token in the ISML template directly addresses the issue of Cross-Site Request Forgery (CSRF) token errors. When a CSRF protection mechanism is implemented, it typically requires a unique token to be included with each form that is submitted. This token is a security measure to ensure that the request is being made by an authenticated user and not by a malicious third party.

By including the CSRF token in the ISML template, you ensure that every form rendered on the page includes this crucial token. This way, when the form is submitted, the system can verify that the submitted token matches the expected token, thus preventing CSRF attacks. It's essential to add this token for each form submission to reinforce the security framework of the application.

In contrast, other options may not effectively address the core issue of proper CSRF token handling. For instance, extending the CSRF token validity might offer more time for token usage but does not inherently solve the problem of missing tokens in the forms. Deleting CSRF whitelists or adding middleware steps might not guarantee that the tokens are being appropriately embedded in the UI, which leaves room for potential errors.