I receive this error when I click on simbols "Media" in administrative panel, please help me what have i do??? } else { throw new ParseException(sprintf('Malformed inline YAML string (%s).', $scalar)); }

        // a non-quoted string cannot start with @ or ` (reserved) nor with a scalar indicator (| or >)
        if ($output && ('@' === $output[0] || '`' === $output[0] || '|' === $output[0] || '>' === $output[0])) {
            throw new ParseException(sprintf('The reserved indicator "%s" cannot start a plain scalar; you need to quote the scalar.', $output[0]));
        }

        if ($evaluate) {
            $output = self::evaluateScalar($output, $references);
        }
    }

Hi, please update to v2.0.1 and let me know if that resolves that.

Thanks after updates it work