Just a heads up: you can wrap the code section of your post with backticks and it will display here as an actual code-block with formatting that makes it easier for everyone here to read. See point 2 of Please read: make it easier to help you - Meta Discussion - Julia Programming Language (julialang.org) for more details.
The phrase “cannot solve it” can mean a number of different things. Do you get an error when trying to run this code? If so, it would also be helpful to post the resultant stack trace. If not, what happens when you run it?