Help to understand my mistake

[snippsat]

Thus the request to show more code. Otherwise, nobody can help you.

He did post a link to all code on Github in his post.

@TeeMan the code has several errors and do not look good,SyntaxError is always simple errors.
Do not 1-space as indentation,in Python is always 4-space.
To clean most up,i can of course not run this code for testing.

def main():
    index = 0
    gpsp = GpsPoller() # create the thread
    try:
        gpsp.start() # start it up 
        while index == 1:
            lcd.lcd_clear()
            printMessage_1()
            time.sleep(2)   
            lcd.lcd_clear()
            printMessage_2()
            time.sleep(2)   
            lcd.lcd_clear()
            printMessage_3()
            time.sleep(7)   
            lcd.lcd_clear()
            printMessage_4()
            time.sleep(2)   
            lcd.lcd_clear()
            printMessage_5()
            time.sleep(3)   
            lcd.lcd_clear()
            printMessage_6()
            time.sleep(3)   
            lcd.lcd_clear()
            printMessage_7()
            time.sleep(3)   
            lcd.lcd_clear()
            printMessage_8()
            time.sleep(5)   
            lcd.lcd_clear()
            printMessage_9()
            time.sleep(3)   
            lcd.lcd_clear()
            printMessage_10()
            time.sleep(5)
            index += 1
        while True:
            lcd.lcd_clear()
            printMessageTime()
            time.sleep(7)
            lcd.lcd_clear()
            printMessageAltitude()
            time.sleep(7)
            lcd.lcd_clear()
            printMessageQTH()
            time.sleep(7)
    except Exception as error:
        print(error)         

if __name__ == '__main__':
    try:
        main()
    except (KeyboardInterrupt, SystemExit):
        gpsp.running = False
        gpsp.join()

You had a try without a except.
So added this to avoid SyntaxError.

except Exception as error:
    print(error)