Parser Error: Script not fully loaded(cyclic preload)?

Question

This was the error that I had encountered when I had a script inherit from another.

extends "res://entity.gd"

const DAMAGE = 1
const TYPE = 'PLAYER'

var SPEED = 100
var lifetime = 32

func shootatplayer(startpos):
globalposition = startpos
var dest = getparent().getnode('player').globalposition
var direction = (dest - start_pos)
movedir = direction

func physicsprocess(delta):
movement_loop()

if lifetime:
    lifetime -= 1
else:
    queue_free()

0:00:04:0579 - Condition ' debugparseerrline >= 0 ' is true. returned: __null

Type:Error
Description:
Time: 0:00:04:0579
C Error: Condition ' debugparseerrline >= 0 ' is true. returned: __null
C Source: modules/gdscript/gdscripteditor.cpp:287
C Function: debuggetstacklevel_instance

Comments

Please use code blocks. (triple backticks)

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Is there an error in "res://entity.gd", perhaps?
If not, does your game run? If it does then close it and see if this error repeats.
You may also try restarting Godot.

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No errors in the 'entity' script.

The game runs well otherwise. This is a consistent recurring error that still pops up even after restarting.