[TRNSYS-users] problems with creating new wall

[gizmoog]

Dear users,

I just tried to create a new wall in TRNBuild but when I try to save my 
work, it tells me :
"Error creating the wall transfer function coefficients:
stability criteria not fullfilled
check layer definition (thickness, ratio of conductivity/density)
Please check the inf file for further information"

and I check everything but noting seems to be wrong... nothing better in 
the inf file except i know wich wall is responsible for that but I don't 
know what to do more...

any ideas ?

gizmoog