Ahhhh this is not about able to log in, but the currentuser (guess anonymous) isnt allowed to create an object. My second guess is in the microflow attached to the button "create my account" or are you using a nanoflow?

In case of microflow: set apply entity access in microflow properties off

In case of nanoflow; convert your nanoflow onto a microflow. Because nanoflow cannot bypass the access rule. Which you definitly want to do.

is a user role assigned to the registered user?

this error shown.

In case of microflow: set apply entity access in microflow properties off => thank you problem solve

account was created but do not login. in the login page when we put username and password and click login button the page was refresh do not open the home page,stay in login page

default homepage set myfirstmodule.login and rolebased home page set system_admin and target myfirstmodule.home_web