Can't read json from file

I try to read from my Notes file with the argument -t in the ExecVar() function and I get this error

Traceback (most recent call last):
File "", line 48, in <module>
File "", line 31, in ExecVar
File "C:\Users\Dick's Hardware\AppData\Local\Programs\Python\Python36-
32\lib\json\", line 299, in load
parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
File "C:\Users\Dick's Hardware\AppData\Local\Programs\Python\Python36-
32\lib\json\", line 354, in loads
return _default_decoder.decode(s)
File "C:\Users\Dick's Hardware\AppData\Local\Programs\Python\Python36-
32\lib\json\", line 342, in decode
raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 10 column 1 (char 177)

I can write to it just fine. I've added to notes to the jon file so far. Heres the python file

#init json

with open("Notes.json",'r+') as filed:
    Notes = {}
    Notes["Note"] = []
    if "Notes" not in filed:

#Argument Variables

def ExecVar(var):
    if var == "--help":
    print("usage: <Note, Name, Tags[]>\n  \n [-t] 
<SearchTerm> \n -f to open Notes json file\n -t search for a word ")
    elif var == "-f":
    #Open json storage contents
    elif var == "-t":
    #Read from the file by searching 1 or multiple tags
        with open("Notes.json",'r') as outfile:
        #    for tag in Note["Tag"]:
        #        char = str(tag).split()
        #        for chars in char:
        #            print(char)
                    #args = sys.argv[3:]
                    #if char == args[i]:
                    #    i+=1
                    #    i-=1
                    #if len(args) == i:
                    #    print(Note)
EnvVar = ["--help",'-t','-f']

if sys.argv[1] in EnvVar:
    with open('Notes.json','a+') as outfile:
        #Was only writing a portion of the string. changing a to a+ in 
open() solved this
        Tags = []
        args = []
        for arg in sys.argv[3:]:
        Notes["Note"].append({"Name":sys.argv[1], "Note":sys.argv[2], 

Heres the json

  "Note": [
      "Name": "Material on one side",
      "Note": "Select surface on cube > Selection tab > Set Selection",
       "Tags": "Cinema4d,Materials"
  "Note": [
      "Name": "Masking video",
      "Note": "Use the trkmat to select parent in the composition",
      "Tags": "Masking,Aftereffects"

line 47, in <module>
if sys.argv[1] in EnvVar:
IndexError: list index out of range

I haven't dealt with json at all before but the search results i found never got rid of the error. I posted the json because I would'nt be surprised if it was a json error