nusoap | : smirk : Fixed NuSOAP for PHP | SOAP library

so last night i was doing some codes like always(normal class/function code not at all related to kernel or anything) and everything was working perfectly, but today when i wanted to start my coding again this error happend :

as it says in the title, I am trying to make a calculator in which the user enters the numbers and it does the most basic operations. The problem is that the client part does not work when I run it, the screen remains blank, I have checked the routes with the libraries and they are perfectly fine so I don't know where the fault lies, here I attach the code for both the client and the server .

server code:

I try to install:

composer require laravel-notification-channels/pusher-push-notifications

package to my laravel project. But i Keep receive this error

Your requirements could not be resolved to an installable set of packages.

Problem 1 - Root composer.json requires illuminate/support ^5.2, found illuminate/support[v5.2.0, ..., 5.8.x-dev] but these were not loaded, likely because it conflicts with another require.

and here is my composer.json:

I'm getting below error while creating a sample php webservice using nusoap.

This page contains the following errors: error on line 4 at column 6: XML declaration allowed only at the start of the document Below is a rendering of the page up to the first error.

On checking the network tab, I can see that XML output is generated on the 4th line. Cannot figure out why. There is no space before of after tags as I saw as potential reasons online.

I'm using this lib: https://github.com/vpulim/node-soap, to get data from an API. I have a file caled apiDecoder.ts with the following code: