WordPress version: 4.9
Kirki version: 3.0.16

Not sure about the "Unknown key" error
The first error, is because I use "line break" among the output "element" selectors.

Please help ASAP
Thanks
Can you please post the code you're using so that I may replicate your issue and find where the error occurs?
Without a code sample to replicate the issue I don't even know where to start looking
The first bug Invalid or unexpected token is caused by a line break and tab character on output definition. The code I used look like this:
'output' => array(
array(
'element' => '.button, button, input[type="button"], input[type="reset"], input[type="submit"],
.woocommerce #respond input#submit, .woocommerce a.button, .woocommerce button.button, .woocommerce input.button, .woocommerce #respond input#submit.alt, .woocommerce a.button.alt, .woocommerce button.button.alt, .woocommerce input.button.alt, .woocommerce #respond input#submit.alt.disabled, .woocommerce #respond input#submit.alt.disabled:hover, .woocommerce #respond input#submit.alt:disabled, .woocommerce #respond input#submit.alt:disabled:hover, .woocommerce #respond input#submit.alt:disabled[disabled], .woocommerce #respond input#submit.alt:disabled[disabled]:hover, .woocommerce a.button.alt.disabled, .woocommerce a.button.alt.disabled:hover, .woocommerce a.button.alt:disabled, .woocommerce a.button.alt:disabled:hover, .woocommerce a.button.alt:disabled[disabled], .woocommerce a.button.alt:disabled[disabled]:hover, .woocommerce button.button.alt.disabled, .woocommerce button.button.alt.disabled:hover, .woocommerce button.button.alt:disabled, .woocommerce button.button.alt:disabled:hover, .woocommerce button.button.alt:disabled[disabled], .woocommerce button.button.alt:disabled[disabled]:hover, .woocommerce input.button.alt.disabled, .woocommerce input.button.alt.disabled:hover, .woocommerce input.button.alt:disabled, .woocommerce input.button.alt:disabled:hover, .woocommerce input.button.alt:disabled[disabled], .woocommerce input.button.alt:disabled[disabled]:hover, .woocommerce span.onsale, .woocommerce #respond input#submit.disabled, .woocommerce #respond input#submit:disabled, .woocommerce #respond input#submit:disabled[disabled], .woocommerce a.button.disabled, .woocommerce a.button:disabled, .woocommerce a.button:disabled[disabled], .woocommerce button.button.disabled, .woocommerce button.button:disabled, .woocommerce button.button:disabled[disabled], .woocommerce input.button.disabled, .woocommerce input.button:disabled, .woocommerce input.button:disabled[disabled]',
'property' => 'background-color',
),
),
The older version works fine with line break and tab.
About the 2nd error, turns out I used and increment integer for the key of partial_refresh. Something like this:
'partial_refresh' => array(
$p++ => array(
'selector' => '#topbar',
'render_callback' => 'render_topbar',
'container_inclusive' => true,
),
),
The error is from WordPress javascript, so I guess I have to change the way I named the key.
Can you please check using the develop branch now? Should be fixed (see commit)
@aristath It doesn't work for me

@thehung2224 I don't see what your issue has to do with the issue reported in the original post.
Your issue is about the code control. And yes, there is currently a bug with code controls.
Will be fixed ASAP, there was just another bug with radio controls that had to be adressed first because radio controls, textareas etc are a lot more frequently used than code controls.
It's working now.