I just installed FreeCAD and faced a terrible problem (or maybe a bug!). In the sketch section I draw a circle. And then clicked on constraint to set the diameter. But any number I enter, this error message comes up: Zero is not a valid datum for the constraint with index 1
![Image](https://s18.picofile.com/file/8434370684/Annotation_2021_05_22_204741.png)
OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24276 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: a88db11e0a908f6e38f92bfc5187b13ebe470438
Python version: 3.8.6+
Qt version: 5.15.1
Coin version: 4.0.1
OCC version: 7.5.0
Locale: Persian/Iran (fa_IR)
Could you please help me with that? Thanks!