User has Statistica Service deployed to Spotfire Server. Refer to this article on how to deploy Statistica service for Spotfire Server.

User encountered below error when executing Statistica Data Function with Statistica Service through Spotfire Web Player or in Spotfire Analyst:
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Statistica Data Function failed: XXXXXX
Service returned an error: Unable to parse form content
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All supported OS

This error "Unable to parse form content" is likely due to that the user is trying to pass large data set to Statistica Service with the Statistica Data Function. 

The data to be processed in the data function is over the limit configured in the custom.properties for Statistica Service.

The configuration file custom.properties for Statistica service is located in the Node Manager Server services conf folder, for example, 
C:\tibco\tsnm\10.10.2\nm\services\Statistica Service-13.6.0.74-88a55e69-11d4-46a2-92b0-8af8eb63241e\conf

1) Login to Spotfire Server URL with Spotfire Administrator privilege.
2) Stop Statistica Service and its instance under Nodes and Services.
3) Login to Node Manager server and go to "conf" folder where the Statistica Service is installed (For example: C:\tibco\tsnm\10.10.2\nm\services\Statistica Service-13.6.0.74-xxxxxxx-xxxxx-xxxxxxxx-xxxxxxxxx\conf )
4) Open file "custom.properties" in this folder.
5) Change below settings in this file to tune the max-file-size and max-request-size from 100 MB to more than that depending on the size of your data. 6) Save this configuration file and start Statistica Service and its instance under Nodes and Services.

Statistica Data Function failed: XXXXX Service returned an error: Unable to parse form content