How can I solve “z” is not function error in js

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Linux

Node.js

I'm trying to run a smart contract project I got from GitHub for my final year project. The idea of the project is using a smart contract as access control for IoT devices. I installed all the prerequisite tools (nodejs, ganache,web3, sol, npm, truffle.......) and I'm using Ubuntu version 20.4.01 but I keep getting this annoying "capability.AccessRequest is not a function" error over and over again. I looked up for the solution on this website and other websites but, with no luck whatsoever. I tried to resolve the issue by myself but unfortunately, I don't have any prior experiences on Ethereum, nor do I have any experience in Js. So if you could please show me the way to solve this issue I would really appropriate it.

I attached the command line error below.

 ubuntu@ubuntu-VirtualBox:~/Desktop/Blockchain-CapBAC/capability$ node src/js/watchRequest.js 
/home/ubuntu/Desktop/Blockchain-CapBAC/capability/src/js/watchRequest.js:205
var event = capability.AccessRequest();
                       ^
TypeError: capability.AccessRequest is not a function
    at Object.<anonymous> (/home/ubuntu/Desktop/Blockchain-CapBAC/capability/src/js/watchRequest.js:205:24)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

and the code is here sorry the code is very long this just a segment

What I have tried:

// addressの読み込み
    var networks = builded.networks;
    var contractAddress = networks[13].address;
    // var address = 0xF2Cf314DB895fA6f6E41cF03b4BDf981e68fc6C3;

    var capability = new web3.eth.Contract(abi, contractAddress);
    // console.log(smartKey);
    var event = capability.AccessRequest();
   
    });