# Activiti Core FAQs Q: we are trying to build gradle file with following dependency "compile group: 'org.activiti', name: 'activiti-engine', version: '7.0.0.GA'" I am trying with java 8 annd 11 both in local system. its build but when i execute in wildfly server 9.1 its give me error like " class file has wrong version 55.0, should be 52.0" .can you please suggest which version i used for build gradle and how to resolved this error. A: this was fixed for 7.0.0.SR1, so we recommend to use this version or 7.1.x Release train --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://activiti.gitbook.io/activiti-7-developers-guide/faq/faq-activiti-core.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.