Issue while activating theme: Using WordPress 5.9 version

Hi,
I have problem while activating the theme. receiing below error message all the time.

“There has been a critical error on this website. Please check your site admin email inbox for instructions.”

WordPress version 5.9
Current theme: Basel (version 5.6.1)
Current plugin: (version )
PHP version 5.6.40

Anyone let me know what could be the issue here. ?

Hello,

Thank you very much for choosing our theme and for contacting us.

Please disable all the plugins before updating. Then update the plugins in Appearance > Install plugins.

Best Regards

[Author]

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