Selenium webdriver exception in Linux

Question

I am using python3 in kali linux 2018.3,selenium 3.13 and firefox61,geckodriver21, i dowloaded the geckodriver and added it to my path, after running the code i get this error:

raise exception_class(message, screen, stacktrace)selenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities

Here is my code:

from selenium import webdriver


def main():

    try:
        # driver = webdriver.Chrome()
        driver = webdriver.Firefox()
        driver.get("https://www.amazon.com")
        element = driver.find_element_by_id("twotabsearchtextbox")
        usr_input = "jackets"
        element.send_keys(usr_input)
        element = driver.find_element_by_css_selector('.nav-search-submit .nav-input').click()
        driver.close()
    except TimeoutError:
        print("fail")
if __name__ == '__main__':

    main()

i tried the same with chrome and it worked just fine.