Dolphin 7.3.3 contains errors

The registration form
Dolphin 7.3.3 contains errors:
The container reports
"the contains errors,
please correct this
and try again "
can someone advice?

What does it say when you mouse over the i

is ggmail.com the problem?

Is there a whitespace at the beginning of the e-mail?

Is the password the same?

Is there already someone with that username?

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Michel - Meta-Travel.com
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Hi

the data inputs are all correct.