Ubuntu 20.04 System Monitoring with Conky widgets - LinuxConfig.org

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Conky is a system monitoring program for Linux and BSD that runs on the GUI. It monitors various system resources to report the current usage of CPU, memory, disk storage, temperatures, users logged in, currently playing song, etc. in a sleek little widget on your screen. This way, you're able to see at a quick glance how your computer's components are being utilized.

This is a companion discussion topic for the original entry at https://linuxconfig.org/ubuntu-20-04-system-monitoring-with-conky-widgets
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Thx Conky settings!
But error “font” settings Ubuntu 20.04.2 LTS

conky: warning: invalid head index, ignoring head settings
conky: warning: invalid head index, ignoring head settings

My Settings:
update_interval = 1,
cpu_avg_samples = 2,
net_avg_samples = 2,
out_to_console = false,
override_utf8_locale = true,
double_buffer = true,
no_buffers = true,
text_buffer_size = 32768,
imlib_cache_size = 0,
own_window = true,
own_window_type = ‘normal’,
own_window_argb_visual = true,
own_window_argb_value = 80,
own_window_hints = ‘undecorated,below,sticky,skip_taskbar,skip_pager’,
border_inner_margin = 6,
border_outer_margin = 6,
xinerama_head = 1,
alignment = ‘bottom_right’,
gap_x = 18,
gap_y = 44,
draw_shades = false,
draw_outline = false,
draw_borders = false,
draw_graph_borders = true,
use_xft = true,
font = ‘Ubuntu Mono:size=12’,
xftalpha = 0.8,
uppercase = false,
default_color = ‘White’,
own_window_colour = ‘#000000’,
minimum_width = 280, minimum_height = 280,
alignment = ‘top_right’,

What error?
Thx:)