diff --git a/src/Plugins/SimplnxCore/src/SimplnxCore/Filters/ReadCSVFileFilter.cpp b/src/Plugins/SimplnxCore/src/SimplnxCore/Filters/ReadCSVFileFilter.cpp
index 7ff5977cc9..76964bb12a 100644
--- a/src/Plugins/SimplnxCore/src/SimplnxCore/Filters/ReadCSVFileFilter.cpp
+++ b/src/Plugins/SimplnxCore/src/SimplnxCore/Filters/ReadCSVFileFilter.cpp
@@ -67,6 +67,22 @@ enum class IssueCodes
   IGNORED_TUPLE_DIMS = -200
 };
 
+StringVector RemoveIllegalCharacters(StringVector& headers)
+{
+  for(int i = 0; i < headers.size(); i++)
+  {
+    auto& headerName = headers[i];
+    // Replace all illegal characters with '_' character. The header names become array names which is the issue.
+    // This should have been taken care of in the GUI, but if someone is trying this from Python they will not have done that
+    // or if they are just reading it in through nxrunner.
+    headerName = StringUtilities::replace(headerName, "&", "_");
+    headerName = StringUtilities::replace(headerName, ":", "_");
+    headerName = StringUtilities::replace(headerName, "/", "_");
+    headerName = StringUtilities::replace(headerName, "\\", "_");
+    headerName = StringUtilities::replace(headerName, "\"", "");
+  }
+  return headers;
+}
 // -----------------------------------------------------------------------------
 Result<OutputActions> validateExistingGroup(const DataPath& groupPath, const DataStructure& dataStructure, const std::vector<std::string>& headers)
 {
@@ -530,9 +546,11 @@ IFilter::PreflightResult ReadCSVFileFilter::preflightImpl(const DataStructure& d
     return {MakeErrorResult<OutputActions>(to_underlying(IssueCodes::INCORRECT_MASK_COUNT), errMsg), {}};
   }
 
+  headers = RemoveIllegalCharacters(headers);
+
   for(int i = 0; i < headers.size(); i++)
   {
-    const auto& headerName = headers[i];
+    auto& headerName = headers[i];
     if(headerName.empty())
     {
       std::string errMsg = fmt::format("The header for column #{} is empty.  Please fill in a header for column #{}.", i + 1, i + 1);
@@ -651,6 +669,8 @@ Result<> ReadCSVFileFilter::executeImpl(DataStructure& dataStructure, const Argu
     headers = readCSVData.customHeaders;
   }
 
+  headers = RemoveIllegalCharacters(headers);
+
   DataPath groupPath = createdDataGroup;
   if(useExistingGroup)
   {
diff --git a/src/Plugins/SimplnxCore/test/ReadCSVFileTest.cpp b/src/Plugins/SimplnxCore/test/ReadCSVFileTest.cpp
index 99c108ac14..f776f00b7c 100644
--- a/src/Plugins/SimplnxCore/test/ReadCSVFileTest.cpp
+++ b/src/Plugins/SimplnxCore/test/ReadCSVFileTest.cpp
@@ -206,9 +206,16 @@ void TestCase_TestImporterData_Error(const std::string& inputFilePath, usize sta
 
   // Execute the filter and check the result
   auto executeResult = filter.execute(dataStructure, args);
-  SIMPLNX_RESULT_REQUIRE_INVALID(executeResult.result);
-  REQUIRE(executeResult.result.errors().size() == 1);
-  REQUIRE(executeResult.result.errors()[0].code == expectedErrorCode);
+  if(expectedErrorCode == 0)
+  {
+    SIMPLNX_RESULT_REQUIRE_VALID(executeResult.result);
+  }
+  else
+  {
+    SIMPLNX_RESULT_REQUIRE_INVALID(executeResult.result);
+    REQUIRE(executeResult.result.errors().size() == 1);
+    REQUIRE(executeResult.result.errors()[0].code == expectedErrorCode);
+  }
 }
 
 TEST_CASE("SimplnxCore::ReadCSVFileFilter (Case 1): Valid filter execution")
@@ -456,23 +463,23 @@ TEST_CASE("SimplnxCore::ReadCSVFileFilter (Case 5): Invalid filter execution - I
 
   std::vector<std::string> illegalHeaders = {"Illegal/Header"};
   CreateTestDataFile(tmp_file, v, illegalHeaders);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, 0);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, 0);
 
   illegalHeaders = {"Illegal\\Header"};
   CreateTestDataFile(tmp_file, v, illegalHeaders);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, 0);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, 0);
 
   illegalHeaders = {"Illegal&Header"};
   CreateTestDataFile(tmp_file, v, illegalHeaders);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, 0);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, 0);
 
   illegalHeaders = {"Illegal:Header"};
   CreateTestDataFile(tmp_file, v, illegalHeaders);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
-  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, k_IllegalNames);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::LINE, 1, {','}, {}, {DataType::int8}, {false}, tupleDims, v, 0);
+  TestCase_TestImporterData_Error(tmp_file.string(), 2, ReadCSVData::HeaderMode::CUSTOM, 1, {','}, illegalHeaders, {DataType::int8}, {false}, tupleDims, v, 0);
 
   fs::remove(tmp_file);
 
diff --git a/src/simplnx/DataStructure/DataPath.cpp b/src/simplnx/DataStructure/DataPath.cpp
index 9b6d56979c..619d06e451 100644
--- a/src/simplnx/DataStructure/DataPath.cpp
+++ b/src/simplnx/DataStructure/DataPath.cpp
@@ -22,7 +22,7 @@ DataPath::DataPath(std::vector<std::string> path)
   {
     if(!DataObject::IsValidName(item) && !item.empty())
     {
-      throw std::invalid_argument("DataPath: Invalid DataObject name");
+      throw std::invalid_argument(fmt::format("DataPath: Invalid DataObject name - [{}]. One of the DataObject names contains the '/' character.", fmt::join(m_Path, ",")));
     }
   }
 }
diff --git a/src/simplnx/Utilities/StringUtilities.hpp b/src/simplnx/Utilities/StringUtilities.hpp
index 50ee3192e2..9a92915c82 100644
--- a/src/simplnx/Utilities/StringUtilities.hpp
+++ b/src/simplnx/Utilities/StringUtilities.hpp
@@ -166,24 +166,24 @@ inline constexpr StringLiteral k_Whitespaces = " \t\f\v\n\r";
 
 /**
  * @brief Replace characters in a string. If 'from' is empty, the origin string is returned.
- * @param str Input String
+ * @param inputString Input String
  * @param from Characters to replace (These characters are being replaced)
  * @param to The characters to be used as the replacement
  * @return The modified string
  */
-inline std::string replace(std::string str, std::string_view from, std::string_view to)
+inline std::string replace(std::string inputString, std::string_view from, std::string_view to)
 {
   usize startPos = 0;
   if(from.empty())
   {
-    return str;
+    return inputString;
   }
-  while((startPos = str.find(from, startPos)) != std::string::npos)
+  while((startPos = inputString.find(from, startPos)) != std::string::npos)
   {
-    str.replace(startPos, from.length(), to);
+    inputString.replace(startPos, from.length(), to);
     startPos += to.length();
   }
-  return str;
+  return inputString;
 }
 
 inline std::string ltrim(std::string_view str)