遇到这样的错误意味什么？

java.lang.NoClassDefFoundError: Could not initialize class okhttp3.internal.Util public String getToken() throws IOException { AccessToken accessToken = new AccessToken(accessKeyId, accessKeySecret); accessToken.apply(); String token = accessToken.getToken(); long expireTime = accessToken.getExpireTime(); System.out.println(token); System.out.println(expireTime); return token; }遇到这样的错误意味什么？