Allow users to specify the contracts backend in abi-gen

1 files changed, 3 insertions, 3 deletions

diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index 6bafc84c1..e0f6bd539 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -858,7 +858,7 @@ export class ExchangeWrapper extends ContractWrapper {
         });
         if (!_.isUndefined(errLog)) {
             const logArgs = (errLog as LogWithDecodedArgs<LogErrorContractEventArgs>).args;
-            const errCode = logArgs.errorId.toNumber();
+            const errCode = logArgs.errorId;
             const errMessage = this._exchangeContractErrCodesToMsg[errCode];
             throw new Error(errMessage);
         }
@@ -906,11 +906,11 @@ export class ExchangeWrapper extends ContractWrapper {
         if (!_.isUndefined(this._exchangeContractIfExists)) {
             return this._exchangeContractIfExists;
         }
-        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
+        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
             artifacts.ExchangeArtifact,
             this._contractAddressIfExists,
         );
-        const contractInstance = new ExchangeContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
+        const contractInstance = new ExchangeContract(this._web3Wrapper, abi, address);
         this._exchangeContractIfExists = contractInstance;
         return this._exchangeContractIfExists;
     }