Installation error : The administrator username can contain only alphanumeric characters, underscores, and hyphens, and must begin and end with an alphanumeric character

Hello,

I am in the process of installing ojs 3, after entering the neccessary informations and when i click install ojs it shows a validation error on the form : The administrator username can contain only
alphanumeric characters, underscores, and hyphens, and must begin and
end with an alphanumeric character.

i tried combining different ways , but not solved

thanks

What specific release of OJS3 are you using, and what username are you trying?

OJS Version 3.0.2.0 and i gave it simple ones : Administrator, Admin, Admin_01 …it did show the error

What if you try all lowercase?

Thank You Very Much , That was the problem!