Error Code encountered during ext debugging: 0 × 80070057

For beginners, some inexplicable errors often occur during ext debugging. If you have no experience, it will take a long time to debug this error.

Today, I encountered such an error during form submission debugging.

 Uncaught exception: [exception... "Component returned failure code: 0x80070057 (ns_error_illegal_value) [nsixmlhttprequest. open] "nsresult:" 0x80070057 (ns_error_illegal_value) "Location:" JS frame: http: // localhost/client/lib/extjs/adapter/EXT/ext-base.js :: anonymous: Line 10 "data: No]

This section is similar to a blue screen.Code, It is troublesome to read.

In fact, this is an error about the failure to open the specified address during Ajax communication. This time, my error is that the parameter URL of the submit method is not assigned a value. This. getform (). Submit ({URL: http: // localhost/handler. ashx,....});

Therefore, the above error is reported.