When JExpress builds your projects and detects any errors, it gives a brief description of the error and an error number. Click on the associated error message to get suggestions about resolving an error.
You should also review all .log files in your JExpress directory. If none of this information provides a solution, then see if you can create additional log files. You can also use one of our technical support programs, including the free support to users working with the trial copy.