The documentation about generating synthetic dataset on this page seems to be incorrect:
http://www.philippe-fournier-viger.com/spmf/Generating_synthetic_sequence_database_with_timestamps.php
```
java -jar spmf.jar run Generate_a_sequence_database_with_timestamps no_input_file output.txt 100 1000 3 7
>/home/cyang/workspace/spmf/spmf.jar
An error while trying to run the algorithm.
ERROR MESSAGE = java.lang.IllegalArgumentException:
The 1st parameter value of this algorithm 'Transaction count' is of an incorrect type. The provided value is 'output.txt' but it should be of type: Integer.
java.lang.IllegalArgumentException:
The 1st parameter value of this algorithm 'Transaction count' is of an incorrect type. The provided value is 'output.txt' but it should be of type: Integer.
at ca.pfv.spmf.gui.CommandProcessor.runAlgorithm(CommandProcessor.java:294)
at ca.pfv.spmf.gui.Main.processCommandLineArguments(Main.java:128)
at ca.pfv.spmf.gui.Main.main(Main.java:54)
```
When I remove the option `no_input_file`, it works fine now.
I am not quite sure if the problem is related with old version of spmf.