This is due in raml-parser-2 1.0.38 the snakeyaml dependency was updated to 1.23, but raml-parser-1 (0.8.31) is still using snakeyaml 1.15.
The issue is in how studio resolves dependencies (pomDependencies.xml) as jars from apikit and raml-parser, which is limited to have only one version of a transitive dependency in the same plugin. So, only snakeyaml 1.23 is used and raml-parser-1 can't work with it.
The proposal is to update to 1.23 in raml-parser-1 also which seems to work just fine.
STUDIO-13040
After the upgrade to raml-parser-2 1.0.38 parsing #%RAML 0.8 fails with
java.lang.NoSuchMethodError: org.yaml.snakeyaml.nodes.SequenceNode.getFlowStyle()Ljava/lang/Boolean;
This is due in raml-parser-2 1.0.38 the snakeyaml dependency was updated to 1.23, but raml-parser-1 (0.8.31) is still using snakeyaml 1.15.
The issue is in how studio resolves dependencies (pomDependencies.xml) as jars from apikit and raml-parser, which is limited to have only one version of a transitive dependency in the same plugin. So, only snakeyaml 1.23 is used and raml-parser-1 can't work with it.
The proposal is to update to 1.23 in raml-parser-1 also which seems to work just fine.