letsencrypt issue sudo: ./letsencrypt-auto: command not found

[islam]

hello
I am trying to install letsencrypt on both my vesta and my Domain name but this issue keep showing:

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sudo: ./letsencrypt-auto: command not found
ERROR: Something went wrong. Check output above.

the issue appeared after I enter the code

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generate_ssl admin islam.hopto.org

any solution please :)