TestCaseResult?list error in interface definition

Hi folks, 

I have a report through which you can trigger a system expression rule test . i have implemented a functionality to notify the rule owner (i.e, the person who last modified the rule). This assigns a task to the owner and sends a mail and displays the form. 

In this, the process of finding the lastModifiedBy value and sending a mail and assigning the task are working correctly but I am getting the following error while displaying the task interface: 

The following is the interface code where the error is: 

a!sectionLayout(
contents:{
if(isnull(local!showDetailsForObject),
a!gridLayout(
label: "",
labelPosition:"COLLAPSED",
headerCells: {
a!gridLayoutHeaderCell(label: ""),
a!gridLayoutHeaderCell(label: "Rule"),
a!gridLayoutHeaderCell(label: "Last Modified"),
a!gridLayoutHeaderCell(label: "Details")
},
columnConfigs: {
a!gridLayoutColumnConfig(width:"ICON"),
a!gridLayoutColumnConfig(weight: 2),
a!gridLayoutColumnConfig(weight: 2),
a!gridLayoutColumnConfig(weight: 1)
},
rows:

a!applyComponents(
function: rule!ART_testResultsGridRowByUser(
_,
local!showDetailsForObject,
local!showDetailsForObjectIndex,
_
),
array: merge(
local!ruleTestResultObjects,
enumerate(length(local!ruleTestResultObjects))+1

)
)
),
rule!ART_testCaseResultsGridFailedTask(
failedTestCasesRows:local!failedTestCasesRows
)
)
/*rule!ART_testCaseResultsGridFailedTask(*/
/*failedTestCasesRows:local!failedTestCasesRows*/
/*)*/

}
)

ART_testResultsGridRowByUser: 

with(
local!status: if(
or(
contains(touniformstring(ri!objectTestResult.testCasesResult.status), "ERROR"),
contains(touniformstring(ri!objectTestResult.testCasesResult.status), "FAIL")
),
"ERROR",
if(contains(touniformstring(ri!objectTestResult.testCasesResult.status), "PASS"),
"PASS",
"IN PROGRESS"
)
),

a!gridRowLayout(
contents: {
a!richTextDisplayField(
value: if(local!status = "PASS",
{
a!richTextImage( image: a!documentImage(document: a!iconIndicator("STATUS_OK")))

},
if(local!status = "ERROR",
{
a!richTextImage(image: a!documentImage(document: a!iconIndicator("STATUS_ERROR")))
},
{
a!richTextImage(image: a!documentImage(document: a!iconIndicator("PROGRESS_RUNNING")))
}
)
)
),
a!linkField(
links: a!safeLink(label: ri!objectTestResult.name, uri: ri!objectTestResult.url)
),
a!textField(
value: text(ri!objectTestResult.lastModifiedOn, "m/d/y h:mm a"),
readOnly: true
),
a!richTextDisplayField(
value: if(local!status="ERROR",
a!richTextItem(
text: with(
local!failures: length(wherecontains("ERROR", touniformstring(ri!objectTestResult.testCasesResult.status))) + length(wherecontains("FAIL", touniformstring(ri!objectTestResult.testCasesResult.status))),
{
local!failures,
if(local!failures=1, " error or failure", " erros or failures")

}
),
link: a!dynamicLink(
value: ri!objectTestResult,
saveInto: {
ri!showDetailsForObject,
a!save(ri!showDetailsForObjectIndex, ri!currentIndex)
}
)
),
"All tests passed"
)
)
}
)
)

Any help would be appreciated. TIA!!!