Copy features to dataset in a loop

I'm trying to write script, that looks at the feature classes in a geodatabase and depending on what the feature class ends with, it creates a new dataset in the geodatabase and copies the file into the new dataset. I have 500 feature classes all ending with a value in the range '1 - 22' therefore the script should create 22 datasets and copies all files ending with the same number into its respective dataset. However, I keep getting an ERROR 000210: Failed to execute (CopyFeatures).This is the code I have so far:

   import arcpy
import os
arcpy.env.workspace = "C:\Users\Daimon Nurse\Desktop\DFMPROJECT\DFMPROJECT.gdb"
arcpy.env.overwriteOutput=True
features = arcpy.ListFeatureClasses()
i = 1
while i <= 22:
    out_dataset_path = "C:\Users\Daimon Nurse\Desktop\DFMPROJECT\DFMPROJECT.gdb"
    out_name = "Zone{0}".format(i)
    arcpy.CreateFeatureDataset_management(out_dataset_path, out_name, sr)
    for feature in features:
        outfile = os.path.join(out_dataset_path,out_name)
        if feature.endswith('n{0}'.format(i)):
            outfile1 = os.path.join(outfile,feature)
            arcpy.CopyFeatures_management(feature, outfile1)
    i = i + 1 

del i, outfile, feature, features, out_name, out_dataset_path, inlayer