adapt with the new public API

remix-lib/src/util.js

@@ -42,6 +42,17 @@ module.exports = {
   },
 
   /*
+    ints: list of BNs
+  */
+  hexListFromBNs: function (bnList) {
+    var ret = []
+    for (var k in bnList) {
+      ret.push('0x' + bnList[k].toString('hex', 64))
+    }
+    return ret
+  },
+
+  /*
     ints: list of IntArrays
   */
   hexListConvert: function (intsList) {

remix-lib/src/web3Provider/web3VmProvider.js

@@ -149,7 +149,7 @@ web3VmProvider.prototype.pushTrace = function (self, data) {
     previousopcode.invalidDepthChange = previousopcode.op !== 'RETURN' && previousopcode.op !== 'STOP'
   }
   var step = {
-    stack: util.hexListConvert(data.stack),
+    stack: util.hexListFromBNs(data.stack),
     memory: util.formatMemory(data.memory),
     storage: data.storage,
     op: data.opcode.name,