Customizer won’t show

I can’t customize my Solo Pine SITKA theme as the customizer won’t show.

I installed the theme and when I click on the websites customizer I get a warning that some KIRKI deader things can not be shown. This warning appears very shortly and then the customizer will not show any options but a blank left column.

Copied/ pasted it looks like this… (I guess in reality it looks different)…

Warning: Invalid argument supplied for fore&sh( ir
homepages27/0898250726/htdocs/3008982510774
content/plugins/kirkilpackages/kirki-framework/field-multico
or/src/Field/Multicolor.php on line 219

Warning: Cannot mod fy header information • headers aresay sent by fou.out started at homep30
126/nt00cs/3008982510771wo.cor
packages/kirki-framcworkfiold-muliticolor/src/Field/Multicolorphp:219) in momepages/27ld898250726mhtdocs/aop898

Warn no: Cannot mod fy header information - headers are.
l0y sent by (outout started at homensn
includes/functions, oho on l ne 6878
726/hd/4037/
irk-rameworkifield-muiticolorisrc/Field/oiticolorphp:219) in inomepagesp7d898250726mtdocslapp898
cannot modify header information

The page I need help with: [log in to see the link]