Fix doc link

Fix variable error

Change-Id: I24cae31cc3df080b8906812b81f63b15795dc6e5
Signed-off-by: BigManing <lingshui2008@qq.com>

CONTRIBUTING.md

@@ -9,10 +9,10 @@ docs to learn how to make contributions to this exciting project.
 
 ## Code of Conduct Guidelines <a name="conduct"></a>
 
-See our [Code of Conduct Guidelines](../blob/master/CODE_OF_CONDUCT.md).
+See our [Code of Conduct Guidelines](./CODE_OF_CONDUCT.md).
 
 ## Maintainers <a name="maintainers"></a>
 
-Should you have any questions or concerns, please reach out to one of the project's [Maintainers](../blob/master/MAINTAINERS.md).
+Should you have any questions or concerns, please reach out to one of the project's [Maintainers](./MAINTAINERS.md).
 
 <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.

commercial-paper/organization/digibank/contract/lib/papercontract.js

@@ -111,7 +111,7 @@ class CommercialPaperContract extends Contract {
         if (paper.isTrading()) {
             paper.setOwner(newOwner);
         } else {
-            throw new Error('Paper ' + issuer + paperNumber + ' is not trading. Current state = ' + cp.getCurrentState());
+            throw new Error('Paper ' + issuer + paperNumber + ' is not trading. Current state = ' + paper.getCurrentState());
         }
 
         // Update the paper