Python Global Variable Not Defined

I've seen a lot of questions on global variables, but for some reason I still can't get mine to work.

Here is my scenario - I have my individual test cases and a separate python script that includes different functions for the various error messages you can get in the application I'm testing. If one of the validations fails, I want the function to increment a failure variable and then the main test script will check to see if it's a pass or fail.

class ErrorValidations:
failures = 0

def CheckforError1(driver):
    global failures
    try:
        if error1.is_displayed():
            failures += 1

def CheckforError2(driver):
    global failures
    try:
        if error2.is_displayed():
            failures += 1

def CheckforError3(driver):
    global failures
    try:
        if error3.is_displayed():
            failures += 1

This is a heavily edited example of where the validations get used:

from functionslist import ErrorValidations

def test(driver, browser, test_state):

_modules = driver.find_elements_by_xpath('//div[@class="navlink"]')

for i in _modules:
    i.click()

    ErrorValidations.CheckforError1(driver)
    ErrorValidations.CheckforError2(driver)
    ErrorValidations.CheckforError3(driver)

    if ErrorValidations.failures > 0:
        driver.report.AppendToReport( i.text, "The " + i.text + "page was not able to load without errors.", "fail", "")
    else:
        driver.report.AppendToReport( i.text,  "The " + i.text + "page was able to load without errors.", "pass", "")

The test is not properly incrementing the failures variable and I get the error: name 'failures' is not defined, but I'm not sure where else to define it.