unchecked conversion found!

[javabeginner29]

Here is a part of my code where I am getting this warning "unchecked conversion found" while compiling it:

InputStreamEnumerator e = new InputStreamEnumerator(files);
		InputStream input = new SequenceInputStream(e);

the details of the warning are as follows:

SequenceInputStreamDemo.java:31: warning: [unchecked] unchecked conversion
found   : InputStreamEnumerator
required: java.util.Enumeration<? extends java.io.InputStream>
		InputStream input = new SequenceInputStream(e);
		                                            ^
1 warning

Can anyone please tell me what's to be done?

[Tolls]

What is an InputStreamEnumerator?