Starting SmartPLS

[xixitj2008]

Hello, I am starting to use SmartPLS for my research. In deed, I am creating a new project for the first fime. After enterring "the path to a file which contains indicator data" (--- I do enter a CSV file), it comes the window of "missing values settings". Here the "next" botton is unactive, and keep unactive after I tick "the indicator data contains missing values" (Missingvalue [-1.0]). I wonder: what should I do to make the "next" botton active?

More explain:
- When I press on "finish" instead of "next", everything gone, and it shows back to the beginning window.
- I have checked and make sure that (1) no missing values in the CSV file (ME done); (2) all the variable names are in the first line, and (3) the names are all less than 8 character.

Please help me solve the puzzle. Many many thanks !!!!!!