Interface expression mode

Please help me to figure oute the error - Expression evaluation error: Syntax error. Details: Expression evaluation error at function a!columnLayout parameter 2 [line 33]: Missing right parenthesis in expression, found COMMA

{
a!columnLayout(
columns:{
a!columnLayout(
contents: {
a!richTextDisplayField(
value: (
a!richTextIcon(
icon: ri!icon,
size:choose(
"LARGE",
"MEDIUM_PLUS",
"MEDUIM"
),
color:cons!DU_CHART_COLOR_HEX_CODES
),
)
),
a!richTextItem(
text: " " & ri!label,
size:choose(
"LARGE",
"MEDIUM_PLUS",
"MEDUIM"
)
)
}
),
}
a!columnLayout(
contents: (
ri!extraComponent
),
width: if(
ri!isSectionFullPageWidth,
"WIDE",
"NARROW_PLUS"
),
showWhen: not( isnull (ri!extraComponent ))
),
a!columnLayout(
width: "NARROW" ,
contents: {
a!richTextDisplayField(
labelPosition: "COLLAPSED",
align: "RIGHT",
value: (
a!richTextItem(
text: ri!linklabel,
style: "STRONG",
size: choose(
ri!level,
"MEDUIM",
"STANDARD",
"SMALL"
),
color:cons!DU_CHART_COLOR_HEX_CODES,
link: ri!link,
linkStyle: "STANDALONE"
)
)
)
},
showWhen: not( isnull (ri!showWhen))
)
),

if(ri!doesBottomDividerHaveColor,
a!cardLayout(
style: cons!DU_CHART_COLOR_HEX_CODES
),
a!sectionLayout(
divider: "ABOVE"
)
)
}