chekout is not working on magento 1.9.2.4

[decornmore]

Hi,

I tried to checkout and found this issue

Uncaught TypeError: Singleton.get(...).getForm is not a function
    at Login.isCheckoutValid (onepage.js:478)
    at Login.togglePlaceOrderButton (onepage.js:520)
    at Login.ajaxCall (onepage.js:766)
    at Login.checkExist (login.js:112)
    at HTMLInputElement.<anonymous> (login.js:34)
    at HTMLDocument.dispatch (iwd-jquery-2.1.3.min.js:3)
    at HTMLDocument.r.handle (iwd-jquery-2.1.3.min.js:3)
    at Object.trigger (iwd-jquery-2.1.3.min.js:3)
    at Object.simulate (iwd-jquery-2.1.3.min.js:3)
    at HTMLDocument.c (iwd-jquery-2.1.3.min.js:3)
onepage.js:478 Uncaught TypeError: Singleton.get(...).getForm is not a function
    at BillingAddress.isCheckoutValid (onepage.js:478)
    at BillingAddress.togglePlaceOrderButton (onepage.js:520)
    at BillingAddress.validate (onepage.js:679)
    at onepage.js:609
onepage.js:478 Uncaught TypeError: Singleton.get(...).getForm is not a function
    at BillingAddress.isCheckoutValid (onepage.js:478)
    at BillingAddress.togglePlaceOrderButton (onepage.js:520)
    at BillingAddress.validate (onepage.js:679)
    at onepage.js:649
onepage.js:478 Uncaught TypeError: Singleton.get(...).getForm is not a function
    at BillingAddress.isCheckoutValid (onepage.js:478)
    at BillingAddress.togglePlaceOrderButton (onepage.js:520)
    at BillingAddress.validate (onepage.js:679)
    at onepage.js:609

. I disabled the LiteMage cache, CDN and tried it again. Also, I tried with default Magento checkout by disabling the extension. It is also not working in the sites. I checked logs and found is_AJAX variable issue in the default Magento checkout and tried to solve it with core code updates. It is not working so, I reverted it back. No other errors found in the logs. Also, I am unable to see any IWD extension error in the logs except the browser console. Regarding the browser console error, it looks JS library conflict issue and I am unable to solve based on the knowledge.

[decornmore]

help...? no one can help? 

[decornmore]

Great help on Magento forum. No one can help?!

[decornmore]

help...? 

[decornmore]

i have disabled the one checkout and test the default checkout. i dont have any errors in the code but i cant go from step 1 to 2. something in Magento 1 checkout is not working at all.