If a task fails details can be checked on the Error details tab of the Task properties screen. The same error message can also be checked in the relevant log file.
There are several common issues, the most common categories are the following:

• Memory related issues (e.g. “OutOfMemoryError”, “GC overhead limit exceeded”). In this case, please check the memory settings and hardware requirements of the software.
• Input data related issues (e.g. “unexpected end of zlib input stream”). In this case, please check the integrity of your read files (e.g. try to unpack the files or check the number of lines in both fastq files).