improve possible VM errors

src/app/execution/txExecution.js

@@ -38,6 +38,15 @@ module.exports = {
     * @return {Object} -  { error: true/false, message: DOMNode }
     */
   checkVMError: function (txResult) {
+    var errorCode = {
+      OUT_OF_GAS: 'out of gas',
+      STACK_UNDERFLOW: 'stack underflow',
+      STACK_OVERFLOW: 'stack overflow',
+      INVALID_JUMP: 'invalid JUMP',
+      INVALID_OPCODE: 'invalid opcode',
+      REVERT: 'revert',
+      STATIC_STATE_CHANGE: 'static state change'
+    }
     var ret = {
       error: false,
       message: ''
@@ -47,14 +56,20 @@ module.exports = {
     }
     var error = `VM error: ${txResult.result.vm.exceptionError}.\n`
     var msg
-    if (txResult.result.vm.exceptionError === 'invalid opcode') {
+    if (txResult.result.vm.exceptionError === errorCode.INVALID_OPCODE) {
       msg = `\tThe constructor should be payable if you send value.\n\tThe execution might have thrown.\n`
       ret.error = true
-    } else if (txResult.result.vm.exceptionError === 'out of gas') {
+    } else if (txResult.result.vm.exceptionError === errorCode.OUT_OF_GAS) {
       msg = `\tThe transaction ran out of gas. Please increase the Gas Limit.\n`
       ret.error = true
+    } else if (txResult.result.vm.exceptionError === errorCode.REVERT) {
+      msg = `\tThe transaction has been reverted to the initial state.\n`
+      ret.error = true
+    } else if (txResult.result.vm.exceptionError === errorCode.STATIC_STATE_CHANGE) {
+      msg = `\tState changes is not allowed in Static Call context\n`
+      ret.error = true
     }
-    ret.message = `${error}${msg}\tDebug the transaction to get more information.`
+    ret.message = `${error}${txResult.result.vm.exceptionError}${msg}\tDebug the transaction to get more information.`
     return ret
   }
 }