Hi I am new to this qiime2 . When I try to import my data into qiime2 the following error comes, Can anyone please help to rectify the problem ??
@Bala,
The good news is that this is often the most difficult step in performing your analysis. The bad news is that importing is often the most difficult step in performing your analysis 
It looks like you have found at least some of our documentation, but for the sake of completeness, here is the link to the importing tutorial.
When importing data, there are more or less two different options, selecting from a pre-built convenience methods or manually importing using a document which you generate called a manifest, which essentially just tells QIIME 2 what files you have and where to find them. The convenience methods are just that, convenient if you are working with a common, "conventional" format.
In this case, it looks like you have tried to import your data using one of the Casava convenience methods. This is great as long as your data meets the assumptions about what a Casava formatted data file will look like and that all of the files are where QIIME 2 expects them to be. The message you are getting looks like either QIIME 2 cannot find any files that follow the convention, or since you have said that you are trying to import paired end data, it expects to find both a forward and a reverse read for each sample but cannot find one, the other, or both(the same as case 1).
If you know that your file meet the definition for Casava 1.8 formatted data, I would look through your file list carefully and make sure that you have both forward and reverse reads for each sample, and either find and replace the missing sample reads or remove the unpaired sample from your import directory. I think this is unlikely to be the issue.
If you are unsure if your data meets the requirements for it to be interpreted as Casava 1.8 data, then probably the easiest way forward is to use a manifest import. Really the only downside to performing a manifest import is the slight amount of extra work you have to do to generate the manifest file. See this section of the tutorial to learn about how to do a manifest import. If you have any other questions, feel free to ask again here 
As a slight follow on to this, in the future, if you can copy and paste the commands you ran to generate an error you are encountering, it often helps us solve the issue much faster, otherwise you will probably be asked to do this as a first reply. For it to look good, you can put them inside of a code block by clicking on the
symbol in the text editor menu bar.
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