diff --git a/src/crewai/knowledge/source/csv_knowledge_source.py b/src/crewai/knowledge/source/csv_knowledge_source.py
index 2f5a3cc2c..0946104a4 100644
--- a/src/crewai/knowledge/source/csv_knowledge_source.py
+++ b/src/crewai/knowledge/source/csv_knowledge_source.py
@@ -11,15 +11,18 @@ class CSVKnowledgeSource(BaseFileKnowledgeSource):
     def load_content(self) -> Dict[Path, str]:
         """Load and preprocess CSV file content."""
         super().load_content()  # Validate the file path
-        file_path_str = (
-            str(self.file_path) if isinstance(self.file_path, Path) else self.file_path
+
+        file_path = (
+            self.file_path[0] if isinstance(self.file_path, list) else self.file_path
         )
-        with open(file_path_str, "r", encoding="utf-8") as csvfile:
+        file_path = Path(file_path) if isinstance(file_path, str) else file_path
+
+        with open(file_path, "r", encoding="utf-8") as csvfile:
             reader = csv.reader(csvfile)
             content = ""
             for row in reader:
                 content += " ".join(row) + "\n"
-        return {self.file_path: content}
+        return {file_path: content}
 
     def add(self) -> None:
         """
diff --git a/src/crewai/knowledge/source/excel_knowledge_source.py b/src/crewai/knowledge/source/excel_knowledge_source.py
index 5417b5200..3b5c71514 100644
--- a/src/crewai/knowledge/source/excel_knowledge_source.py
+++ b/src/crewai/knowledge/source/excel_knowledge_source.py
@@ -10,9 +10,15 @@ class ExcelKnowledgeSource(BaseFileKnowledgeSource):
         """Load and preprocess Excel file content."""
         super().load_content()  # Validate the file path
         pd = self._import_dependencies()
-        df = pd.read_excel(self.file_path)
+
+        if isinstance(self.file_path, list):
+            file_path = self.file_path[0]
+        else:
+            file_path = self.file_path
+
+        df = pd.read_excel(file_path)
         content = df.to_csv(index=False)
-        return {self.file_path: content}
+        return {file_path: content}
 
     def _import_dependencies(self):
         """Dynamically import dependencies."""
diff --git a/src/crewai/knowledge/source/json_knowledge_source.py b/src/crewai/knowledge/source/json_knowledge_source.py
index e14be4ff8..490423a00 100644
--- a/src/crewai/knowledge/source/json_knowledge_source.py
+++ b/src/crewai/knowledge/source/json_knowledge_source.py
@@ -13,11 +13,11 @@ class JSONKnowledgeSource(BaseFileKnowledgeSource):
         super().load_content()  # Validate the file path
         paths = [self.file_path] if isinstance(self.file_path, Path) else self.file_path
 
-        content = {}
+        content: Dict[Path, str] = {}
         for path in paths:
             with open(path, "r", encoding="utf-8") as json_file:
                 data = json.load(json_file)
-            content = self._json_to_text(data)
+            content[path] = self._json_to_text(data)
         return content
 
     def _json_to_text(self, data: Any, level: int = 0) -> str: