diff --git a/.idea/php.xml b/.idea/php.xml
index 2600f39..d8075fa 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -54,12 +54,21 @@
       <path value="$PROJECT_DIR$/vendor/sebastian/resource-operations" />
       <path value="$PROJECT_DIR$/vendor/myclabs/php-enum" />
       <path value="$PROJECT_DIR$/vendor/symfony/polyfill-mbstring" />
+      <path value="$PROJECT_DIR$/vendor/symfony/deprecation-contracts" />
+      <path value="$PROJECT_DIR$/vendor/symfony/yaml" />
+      <path value="$PROJECT_DIR$/vendor/symfony/polyfill-ctype" />
+      <path value="$PROJECT_DIR$/vendor/nulib/base" />
     </include_path>
   </component>
   <component name="PhpProjectSharedConfiguration" php_language_level="7.4" />
   <component name="PhpStanOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
+  <component name="PhpUnit">
+    <phpunit_settings>
+      <PhpUnitSettings custom_loader_path="$PROJECT_DIR$/vendor/autoload.php" />
+    </phpunit_settings>
+  </component>
   <component name="PsalmOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
diff --git a/src/phpss/wsutils.php b/src/phpss/wsutils.php
index 14a3152..d20d489 100644
--- a/src/phpss/wsutils.php
+++ b/src/phpss/wsutils.php
@@ -1,7 +1,7 @@
 <?php
 namespace nulib\ext\phpss;
 
-use nulib\ValueException;
+use nulib\exceptions;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
@@ -13,14 +13,14 @@ class wsutils {
     } elseif (is_numeric($wsname)) {
       $sheetCount = $ss->getSheetCount();
       if ($wsname < 1 || $wsname > $sheetCount) {
-        throw ValueException::invalid_value($wsname, "sheet index");
+        throw exceptions::invalid_value($wsname, "sheet index");
       }
       $ws = $ss->getSheet($wsname - 1);
     } else {
       $ws = $ss->getSheetByName($wsname);
       if ($ws === null) {
         if ($create) $ws = $ss->createSheet()->setTitle($wsname);
-        else throw ValueException::invalid_value($wsname, "sheet name");
+        else throw exceptions::invalid_value($wsname, "sheet name");
       }
     }
     return $ws;