error message "Invalid operation"

[shinya]

Hello,

When I clikck the "start" botton, the following message appear.

"Invalid operation: 0./0. not defined"

What problem does the message mean?
Could you tell me how to solve it?

Regards,
shinya

[Christian Bludau]

Hello,
if the message appears only once at the beginning, it doesn´t matter; just don´t care.
If the message "Invalid operation: 0./0. not defined" appears every time step this can have many reasons. Check again all inputs and the material properties. This can also occur if the grid jumps from big to small elements.
If you can not find an error mail me the project directory without the result data file and I can check.
Best regards,
Christian Bludau

[Rupert]

Hello,
I also have encountered the problem of "Invalid operation: 0./0. not defined" appearing repeatedly to no end in my current project. First, the calculation is carried out correctly, if I use "save as" the new project has the problem (even before changing anything). As said before, grid jumps seem to be the problem (the calculation starts correctly after eliminating the membranes in the construction). The only way to work around this I have found so far is to start the input for a new variation of the project from scratch, even when I only want to change the sd-value of the vapour retarder.
Is there a less tedious way around this problem?
Thanks, Rupert