UnboundLocalError: local variable referenced before assignment

[ProgramFilesx86]

Hi ,
Whenever i try to make this tool fuzz it returns me this message

Problem parsing the request data
UnboundLocalError("local variable 'content_type' referenced before assignment",)

And in the error tab it returns me this :

Traceback (most recent call last):
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 82, in start_scan
thread = threading.Thread(target=paramFuzzer.fuzzParams(self.orgHost, self.orgPort, self.orgProtoChoice,
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 82, in start_scan
thread = threading.Thread(target=paramFuzzer.fuzzParams(self.orgHost, self.orgPort, self.orgProtoChoice,
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 266, in fuzzParams
stdout.println("[!] FUZZING "+ str(len(body)) + " PARAMETERS")
TypeError: object of type 'NoneType' has no len()
Traceback (most recent call last):
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 82, in start_scan
thread = threading.Thread(target=paramFuzzer.fuzzParams(self.orgHost, self.orgPort, self.orgProtoChoice,
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 82, in start_scan
thread = threading.Thread(target=paramFuzzer.fuzzParams(self.orgHost, self.orgPort, self.orgProtoChoice,
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 266, in fuzzParams
stdout.println("[!] FUZZING "+ str(len(body)) + " PARAMETERS")
TypeError: object of type 'NoneType' has no len()
Traceback (most recent call last):
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 82, in start_scan
thread = threading.Thread(target=paramFuzzer.fuzzParams(self.orgHost, self.orgPort, self.orgProtoChoice,
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 82, in start_scan
thread = threading.Thread(target=paramFuzzer.fuzzParams(self.orgHost, self.orgPort, self.orgProtoChoice,
File "C:\Users\msi7471\Desktop\BurpSQLTruncSanner-master\SQLTruncScanner.py", line 266, in fuzzParams
stdout.println("[!] FUZZING "+ str(len(body)) + " PARAMETERS")
TypeError: object of type 'NoneType' has no len()

Is there any help about this