Invalid formula error in simple formula

[Anonymous]

I want to calculate the number of multi-circuit wires needed to carry a number of circuits. I have attached a snip of the problem that occurs. I've declared the (shared) parameters as Number and Instance, simplified by omitting Roundup, which has to be there for the result to be real-world, thinking that was the issue (I'm not sure if Integers can co-exist with numbers, even using Roundup), and copy and pasted the text to avoid spelling mistakes, but it still doesn't work.

[BIMAbhi]

1. First you can check with opening a fresh file.
2. Add your required parameter (i.e. a, b, c)
3. Type  a/b in the formula tab in  c parameter

Check the attached snap file

[Anonymous]

Hello @Anonymous

This seems to address your issue.

Issue	When editing the formula for a parameter within the Revit® Family Types dialog, the error "Invalid formula found…" is received.
Cause	The specified Family Type, is dividing by zero.

Solution	Select the Family Type from the Family Types dialog, and modify the parameters or formula to avoid dividing by zero.
See Also	Creating Family Parameters Creating Loadable Families

Let me know how it goes.

Best regards.

[Anonymous · Accepted solution]

Hi all;

I also posted this problem on an independent Revit forum. A member there came up with what turned out to be the solution.

I had to check the formula in each type to ensure no type might wind up dividing by zero, so all occurences of the divisor had to be explicitly non-zero, which involved flipping throught the types to change and confirm. A non-value was not acceptable. I set them all to one. Then, the formula worked fine. 

Thanks for working on my problem.

Dave

[Anonymous]

hi dear all

         i have problem with formula , please help me.