There was a problem trying to load your lab

I want to make labs, Partner Certification Promotion - SLE201v12 SUSE Linux Enterprise Server 12 Administration
i have restarted chrome, and reset the lab without any result

i got this error:
Failure creating stack [sle201v12_promo_2019_promo2_4dfe96c24e53ead591c066e2b60d0589]

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