Failed to fetch pymol

[Yanni]

Hello everyone

I'm not sure if this has anything to do with macports but I am using 
macports to install a specific software called pymol. The laptop is 
10.13.3 High Sierra and up to date.

When I try to install it ("sudo port install pymol") I get the error:

"Failed to fetch pymol: subversion check out failed."


Could someone tell me what it means, please?

Many thanks