title: Member "add" not found or not visible after argument-dependent lookup in struct Chainlink.Request memory
body: <p>I am creating nft smart contract and using chainlinkClient.sol for updation of URI.
  chainlinkClient Version: v0.6
  Error: TypeError: Member &quot;add&quot; not found or not visible after argument-dependent lookup in struct Chainlink.Request memory.
  Any Idea Why am I getting this error?</p>
  <p>Code:</p>
  <pre><code>// SPDX-License-Identifier: MIT
  pragma solidity &gt;=0.6.0 &lt;0.9.0;
  import &quot;chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol&quot;;
  contract phoneNumber is ChainlinkClient{
      uint256 public phone_no;
      address private oracle;
      bytes32 private jobId;
      uint256 private fee;
  
      constructor(uint256 _initial_phone_no){
          setPublicChainlinkToken();
          oracle = 0x7AFe1118Ea78C1eae84ca8feE5C65Bc76CcF879e;
          jobId = &quot;6d1bfe27e7034b1d87b5270556b17277&quot;;
          fee = 0.1 * 10 ** 18; // 0.1 LINK
          phone_no = _initial_phone_no;
      }
      
       function requestVolumeData() public returns (bytes32 requestId) 
      {
          Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.update_phone_no.selector);
          
          // Set the URL to perform the GET request on
          request.add(&quot;get&quot;, &quot;http://localhost:3000/images/phone.json&quot;);
          
  
          request.add(&quot;path&quot;, &quot;phone.new&quot;);
          
          // Multiply the result by 1000000000000000000 to remove decimals
          int timesAmount = 10**18;
          request.addInt(&quot;times&quot;, timesAmount);
          
          // Sends the request
          return sendChainlinkRequestTo(oracle, request, fee);
      }
  
      function update_phone_no(bytes32 _requestId, uint256 new_phone_no) public recordChainlinkFulfillment(_requestId)
      {
          phone_no = new_phone_no;
      }
      
      function withdrawLink() external {
          LinkTokenInterface linkToken = LinkTokenInterface(chainlinkTokenAddress());
          require(linkToken.transfer(msg.sender, linkToken.balanceOf(address(this))), &quot;Unable to transfer&quot;);
      }
  }
  </code></pre>