Yes @Keiji Otsubo. I do have a record triggered flow on User object, which I would want to trigger it whenever a new user is created. And the flow send welcome email to new user. That's when I am seeing the error.
Since I am new to Salesforce altogther, not sure if record triggered flow is the right option to send a welcome email to new user created.
Would be great if I can get any suggestions on how to do that.
Thanks @Keiji Otsubo... I appreciate all your help and support :-) .
Could successfully send a welcome email upon new user creation and also create a contact record from those user details. Modified the config in Create records element as follows and I could successfully create contact record.
User created:
Contact created from using user created above details: