fix private key issue

contracts/Challenge.sol

@@ -152,6 +152,7 @@ contract Challenge {
   function getProposedState(uint256 challengeId) view public returns (bytes32) {
     Chal storage c = challenges[challengeId];
     require(c.challenger != address(0), "invalid challenge");
+    uint256 stepNumber = getStepNumber(challengeId);
     return c.assertedState[stepNumber];
   }
 

hardhat.config.js

@@ -6,7 +6,13 @@ require("@nomiclabs/hardhat-ethers");
 require("hardhat-gas-reporter");
 const fs = require("fs")
 
-const private = fs.readFileSync(process.env.HOME+"/.privatekey").toString()
+// attempt to read private key
+let private = "0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80"
+try {
+  private = fs.readFileSync(process.env.HOME+"/.privatekey").toString()
+} catch {
+}
+
 
 module.exports = {
   defaultNetwork: "cheapeth",