I cant create administrator dspace 7.4

[Мухаметали Кусайынов]

Hello everyone. I need your help. I have two questions.

1)

I installed dspace 7.4. And created a dspace administrator. 

e-mail: dspace_admin

passwd:dspace

But I can't login with this username. Is it mandatory to enter an email address?

2)

when I want to create a new administrator , I run the command:

dspace@dspace7:/opt/solr-8.11.2/bin$ /dspace/bin/dspace create-administrator 

it gives the following error:

-bash: /dspace/bin/dspace: Permission denied

What's my mistake?

How to create a DSpace administrator correctly?

Is it possible to create multiple administrators?

With best regards. Kussaynov M.