Strange error during build

Hi everyone, when i start the application i got this error * What went wrong:
Execution failed for task ‘:vaadinPrepareFrontend’.

com.vaadin.flow.server.ExecutionFailedException: Error occured during goal execution: class com.fasterxml.jackson.databind.node.MissingNode cannot be cast to class com.fasterxml.jackson.databind.node.ObjectNode (com.fasterxml.jackson.databind.node.MissingNode and com.fasterxml.jackson.databind.node.ObjectNode are in unnamed module of loader org.gradle.internal.classloader.VisitableURLClassLoader$InstrumentingVisitableURLClassLoader @3cbf964f) . Yesterday it worked just fine . Any solutions? (seems more like a vaadin problem). Thanks

i think i solved myself, somehow the “package.json” was deleted