diff --git a/GetInfoFromUniqueId.ps1 b/GetInfoFromUniqueId.ps1
index 1ccea96..454dc62 100644
--- a/GetInfoFromUniqueId.ps1
+++ b/GetInfoFromUniqueId.ps1
@@ -27,19 +27,22 @@ switch($uniqueIdType){
     "AROA" { $command="list-roles"    }
     "ASCA" { $command="list-server-certificates" }
     # "ASIA" { $command="" }
+    default { Write-Output "Invalid 'target' value."; return}
 }
 
 $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine")
 $awsCommand = "aws iam $command"
-$retunedObjects = Invoke-Expression $awsCommand | ConvertFrom-Json
+Invoke-Expression $awsCommand -OutVariable succOut -ErrorVariable errOut 2>&1 >$null
 
-if ($returnedObjects -eq $null) {
+if ($errOut -ne $null) {
+    Write-Output "$($errOut[1].ToString())"
     return
 }
+else {
+    $returnedObjects = $succOut | ConvertFrom-Json
+}
 
-$objectFound=$false
-
-foreach($object in $retunedObjects.Policies) {
+foreach($object in $returnedObjects.Policies) {
     if ($objectFound -eq $true) {
         break
     }
@@ -53,6 +56,6 @@ foreach($object in $retunedObjects.Policies) {
         if ($id -eq $true) {
             Write-Output "$($object.PolicyId)"
         }
-        $objectFound=$true
+        return
     }
-}
+}
\ No newline at end of file