请问下这是什么错误，怎么解决在aar测试时产生的？

EXECUTE check-coverage using XML input File :: D:\nextance\nexbase\7.0/out/report/coverage/coverage.xml

Threshold input Details ::
************************ Threshold Values ************************
Module :: All_Classes_Check
Class Threshold :: 21.4%
Method Threshold :: 12.5%
Block Threshold :: 9.3%
Line Threshold :: 9.6%
******************************************************************

Checking.....
Current coverage ( CLASS 22.5%, METHOD 14.1%, BLOCK 10.7% and LINE 0.0%) is less than the given threshold for module :: [All_Classes_Check]
Failing the build now...

BUILD FAILED
D:\nextance\nexbase\7.0\base\bin\build.xml:115: The following error occurred while executing this line:
D:\nextance\nexbase\7.0\base\bin\buildmodules\base.xml:917: Current coverage ( CLASS 22.5%, METHOD 14.1%, BLOCK 10.7% and LINE 0.0%) is less than the given threshold for module :: [All_Classes_Check]<checkema_threshold/>

Total time: 10 minutes 18 seconds
Archiving artifacts
Finished: FAILURE