[ESPResSo-users] Plane cell constraints

[Robyn Latimer (x2011ryq)]

Hi everyone, 

I'm trying to set up a system with tunable-slip boundary interactions. In the 
user guide it says that two plane cell constraints are required to implement 
this interaction. Before I start using the tunable-slip boundary interactions I 
was trying to get the system to work with just the plane cell constraints. The 
system runs perfectly fine without the plane cell constraints, however when I 
add them in I get the error " background_errors 0 {999 force on particle was 
NAN.}" many times as soon as integration starts. Does anyone have any idea why 
this is happening and a possible solution to the problem?

Thanks very much