Contours have no z-data after conversion

[Rogestem]

Contours have no z-data after conversion. What can be done to solve this?

[arturmlribeiro]

Maye you find the same problem that I found. the values are not numeric but text so when you want to get a z values, program cannot find it because is looking for a numeric value, but finds a text value! If so, you need to convert that field from text to numeric.. hope that can help you!