![QGIS Advanced Python Field Calculator Error: File "<string>", line 1, in <module> NameError: name 'DN is not defined - Geographic Information Systems Stack Exchange QGIS Advanced Python Field Calculator Error: File "<string>", line 1, in <module> NameError: name 'DN is not defined - Geographic Information Systems Stack Exchange](https://i.stack.imgur.com/am9JJ.png)
QGIS Advanced Python Field Calculator Error: File "<string>", line 1, in <module> NameError: name 'DN is not defined - Geographic Information Systems Stack Exchange
![arcpy - getting syntax error name 'parameters' is not defined? - Geographic Information Systems Stack Exchange arcpy - getting syntax error name 'parameters' is not defined? - Geographic Information Systems Stack Exchange](https://i.stack.imgur.com/ba0Cz.png)
arcpy - getting syntax error name 'parameters' is not defined? - Geographic Information Systems Stack Exchange
Code-Checker throws 'variable not defined' error in-spite of having defined & used it. Why does the assignment checker not looking inside the definitions of functions? - DQ Courses - Dataquest Community
![javascript - Argument of type 'string | undefined' is not assignable to parameter of type 'string' - TypeScript error - Stack Overflow javascript - Argument of type 'string | undefined' is not assignable to parameter of type 'string' - TypeScript error - Stack Overflow](https://i.stack.imgur.com/jNJX2.png)
javascript - Argument of type 'string | undefined' is not assignable to parameter of type 'string' - TypeScript error - Stack Overflow
![Validation Error Compiler error(s) encountered processing expression Operator '+' is not defined for types 'String' and 'Newtonsoft.Json.Linq.JObject'. Main.xaml - Automation Starter - UiPath Community Forum Validation Error Compiler error(s) encountered processing expression Operator '+' is not defined for types 'String' and 'Newtonsoft.Json.Linq.JObject'. Main.xaml - Automation Starter - UiPath Community Forum](https://global.discourse-cdn.com/uipath/optimized/4X/f/2/e/f2e9f181c8f60ac59267777e8fcb9e4bb20f32a8_2_666x500.png)
Validation Error Compiler error(s) encountered processing expression Operator '+' is not defined for types 'String' and 'Newtonsoft.Json.Linq.JObject'. Main.xaml - Automation Starter - UiPath Community Forum
![Variable is not defined error for f-string debug statement · Issue #686 · microsoft/pylance-release · GitHub Variable is not defined error for f-string debug statement · Issue #686 · microsoft/pylance-release · GitHub](https://user-images.githubusercontent.com/13234442/101118575-5b2e9980-35b7-11eb-8373-f3bdbda7ae77.png)