Hi, maybe somebody did see the error before and can help me. I’m getting the following error, when creating a local deployment package, or creating a deployment package in the private cloud. This is happening after upgrading my project from Mendix 9.6.10 to 9.12.1. Unexpected exception: RangeError (index): Invalid value: Valid value range is empty: 0 dart:core _OneByteString.codeUnitAt package:sass/src/visitor/serialize.dart 267 _SerializeVisitor._writeImportUrl package:sass/src/visitor/serialize.dart 240 _SerializeVisitor.visitCssImport.<fn>.<fn> package:sass/src/util/source_map_buffer.dart 57 SourceMapBuffer.forSpan package:sass/src/visitor/serialize.dart 1147 _SerializeVisitor._for package:sass/src/visitor/serialize.dart 240 _SerializeVisitor.visitCssImport.<fn> package:sass/src/util/source_map_buffer.dart 57 SourceMapBuffer.forSpan package:sass/src/visitor/serialize.dart 1147 _SerializeVisitor._for package:sass/src/visitor/serialize.dart 237 _SerializeVisitor.visitCssImport package:sass/src/ast/css/modifiable/import.dart 32 ModifiableCssImport.accept package:sass/src/visitor/serialize.dart 169 _SerializeVisitor.visitCssStylesheet package:sass/src/ast/css/modifiable/stylesheet.dart 19 ModifiableCssStylesheet.accept package:sass/src/visitor/serialize.dart 61 serialize package:sass/src/compile.dart 162 _compileStylesheet package:sass/src/compile.dart 70 compile package:sass/src/executable/compile_stylesheet.dart 96 compileStylesheet d:\a\dart-sass\dart-sass\bin\sass.dart 64 main I can build the css file and css map when using the sass batch file in the studio pro installation folder, without getting any error message.