Error evaluating expression

Hi I have written this query to fetch result based on two filter criteria. When I am passing either of employeeId or Created by it throws the following error. But if I pass both employeeId and CreatedBy it works properly. Can anyone help as in what is wrong in this?

The error:

The code:

rule!NGS_queryEntityRefresh(
dataStoreEntity: cons!NGS_DSE_QPP_PERFORMANCE_TRACKER,
returnType: ri!returnType,
executeWhen: ri!executeWhen,
queryLogicalExpression: a!queryLogicalExpression(
operator: "OR",
logicalExpressions: {
a!queryLogicalExpression(
operator: "AND",
filters: {
a!queryFilter(
field: "employeeId",
operator: "in",
value: ri!employeeIds,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
),
a!queryFilter(
field: "discussionTopicRefId",
operator: "in",
value: ri!discussionTopicRefIds,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
),
a!queryFilter(
field: "discussionSubtopicRefId",
operator: "in",
value: ri!discussionSubtopicRefIds,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
),
a!queryFilter(
field: "date",
operator: ">=",
value: ri!startDate,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
),
a!queryFilter(
field: "date",
operator: "<=",
value: ri!endDate,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
),
a!queryFilter(
field: "isActive",
operator: "=",
value: true,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
),
a!queryFilter(
field: "followUpStatusRefId",
operator: "in",
value: ri!followUpStatusRefId,
applyWhen: not(rule!NGS_isBlank(ri!employeeIds))
)
},
ignoreFiltersWithEmptyValues: true
),
a!queryLogicalExpression(
operator: "AND",
filters: {
a!queryFilter(
field: "discussionTopicRefId",
operator: "in",
value: ri!discussionTopicRefIds,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
),
a!queryFilter(
field: "discussionSubtopicRefId",
operator: "in",
value: ri!discussionSubtopicRefIds,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
),
a!queryFilter(
field: "date",
operator: ">=",
value: ri!startDate,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
),
a!queryFilter(
field: "date",
operator: "<=",
value: ri!endDate,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
),
a!queryFilter(
field: "isActive",
operator: "=",
value: true,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
),
a!queryFilter(
field: "followUpStatusRefId",
operator: "in",
value: ri!followUpStatusRefId,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
),
a!queryFilter(
field: "createdBy",
operator: "in",
value: ri!createdBy,
applyWhen: not(rule!NGS_isBlank(ri!createdBy))
)

},
ignoreFiltersWithEmptyValues: true
)
}
),
pagingInfo: ri!pagingInfo,
fetchTotalCount: true
)