diff --git a/lms/djangoapps/mobile_api/users/views.py b/lms/djangoapps/mobile_api/users/views.py
index b5b900b4504c..81051057b7aa 100644
--- a/lms/djangoapps/mobile_api/users/views.py
+++ b/lms/djangoapps/mobile_api/users/views.py
@@ -155,7 +155,7 @@ def _last_visited_block_path(self, request, course):
         the course block. If there is no such visit, the first item deep enough down the course
         tree is used.
         """
-        field_data_cache = FieldDataCache.cache_for_block_descendents(
+        field_data_cache = FieldDataCache.cache_for_descriptor_descendents(
             course.id, request.user, course, depth=2)
 
         course_block = get_block_for_descriptor(
@@ -188,15 +188,14 @@ def _update_last_visited_module_id(self, request, course, module_key, modificati
         """
         Saves the module id if the found modification_date is less recent than the passed modification date
         """
-        field_data_cache = FieldDataCache.cache_for_block_descendents(
+        field_data_cache = FieldDataCache.cache_for_descriptor_descendents(
             course.id, request.user, course, depth=2)
         try:
-            descriptor = modulestore().get_item(module_key)
+            block_descriptor = modulestore().get_item(module_key)
         except ItemNotFoundError:
-            log.error(f"{errors.ERROR_INVALID_MODULE_ID} %s", module_key)
             return Response(errors.ERROR_INVALID_MODULE_ID, status=400)
         block = get_block_for_descriptor(
-            request.user, request, descriptor, field_data_cache, course.id, course=course
+            request.user, request, block_descriptor, field_data_cache, course.id, course=course
         )
 
         if modification_date: