We currently use gradle 5.6.4 version. After I upgrade the gradle version, above 6, I tried with 6.3 and 6.7.1, the following error occurs:

```
What went wrong:

Execution failed for task ':compileJava'.

> Could not resolve all files for configuration ':compileClasspath'.

   > Could not find com.lowagie:itext:2.1.7.js8.

     Required by:

         project : > net.sf.jasperreports:jasperreports:6.16.0

```

The dependency exists in ".gradle/caches/modules-2/files-2.1". I also tried with --refresh-dependencies flag, but nothing works. Any ideas?