In the EasyUpload.AmazonS3.WindowsApp.exe.config file,

Change the XML value tags in the following elements from 


<setting name="AccessKeyID" serializeAs="String">
 	<value />
</setting>
<setting name="SecretAccessKey" serializeAs="String">
				<value />
</setting>

to 

<setting name="AccessKeyID" serializeAs="String">
 	<value>AccessID</value>
</setting>
<setting name="SecretAccessKey" serializeAs="String">
				<value>SecretKey</value>
</setting>


where AccessID is your Amazon S3 accessID and 
your secret key is your Amazon S3 secret key.