CI_ENVIRONMENT = development not working

Finally I solved it - was really related to the server settings. I'm using a Fastpanel at first time and I was not familiar to all settings possibilities.
A global php setting display_errors was set to 1 but it did not helps.
I found that each site created in fast panel has own php settings. I found the same setting display_errors and it was not set to any value. I set it to 1 and now all works fine - CI errors appeared in page.

May be this helps to someone.

Best regards,
Romans