Running reports in XLS format throws the below error. PDF reports work fine.
This problem happens when tomcat library versions conflict. There should only be the 1.1 version of ooxml-schemas jar and the 3.12 version of poi- and poi-ooxml jars.
1. From Chronicall\tomcat\webapps\ROOT\WEB-INF\lib, backup up any jars which start with the word "ooxml-schemas", "poi-ooxml" and "poi-" (place the backup in a directory outside of Chronicall). Then delete these jars.
2. Copy the jars in the attachment to Chronicall\tomcat\webapps\ROOT\WEB-INF\lib
3. Restart Chronicall services.