ValueError: Could not find class nnUNetPlannerResEnc

[IA5213]

I wrote this code :
nnUNetv2_plan_experiment -d 100 -pl nnUNetPlannerResEnc M
and here's the error I'm getting. When I looked through the source file, I couldn't find the class in question. Has anyone encountered this error before?
Traceback (most recent call last):
File "/opt/conda/bin/nnUNetv2_plan_experiment", line 8, in
sys.exit(plan_experiment_entry())
File "/home/pyuser/wkdir/nnUNet/nnunetv2/experiment_planning/plan_and_preprocess_entrypoints.py", line 65, in plan_experiment_entry
plan_experiments(args.d, args.pl, args.gpu_memory_target, args.preprocessor_name, args.overwrite_target_spacing,
File "/home/pyuser/wkdir/nnUNet/nnunetv2/experiment_planning/plan_and_preprocess_api.py", line 221, in plan_experiments
raise ValueError(f"Could not find class {experiment_planner_class_name}")
ValueError: Could not find class nnUNetPlannerResEnc

[Malitha123]

nnUNetv2_plan_experiment -d 100 -pl nnUNetPlannerResEncM

shouldnt it be like above?