Apex Code Development 
I have installed AWS S3 toolkit on sdfc. I have the following code where AWS_S3_ExampleController is part of the installed toolkit. When i execute this code the debug log shows the generic "internal Server error" 500.
The returned soap message has
soapenv:Value>ns1:Client.InvalidArgument soapenv:Value soapenv:Code soapenv:Reasonsoapenv:Text xml:lang="en"Invalid id /soapenv:Text/soapenv:Reason soapenv:Detail ArgumentValue>SAmeer Thakur ArgumentValue>ArgumentName>CanonicalUser/ID/soapenv:Detail>soapenv:Fault> soapenv:Body>soapenv:Envelope>
I do not know how to resolve the Invalid id being seen
The code is:
AWS_S3_ExampleController c = new AWS_S3_ExampleController();
c.constructor();
c.fileName=fileName;
c.OwnerId='Sameer Thakur';
c.bucketToUploadObject= bucketName;
c.fileSize=100000;
c.fileBlob= Blob.valueOf(record);
c.accessTypeSelected='public-read-write';
System.debug('Before insert');
c.syncFilesystemDoc();
System.debug('After insert');
Any pointer would be appreciated Thank you Sameer
The problem was i needed to define ownerid with canonical value. This value is generated using access key and secret key.
The url to generate canonical user id value is @ http://www.bucketexplorer.com/awsutility.aspx
Thanks
Sameer