class AuthError(Exception):
    pass


class DatabaseError(Exception):
    pass


class GitHubError(Exception):
    pass


class NCBIError(Exception):
    pass

class AuthError(Exception):
    pass


class DatabaseError(Exception):
    pass


class GitHubError(Exception):
    pass


class NCBIError(Exception):
    pass


class ProxyError(Exception):
    pass

Add virtool.errors.ProxyError