Prior to running a Revit Database Export, there is no defined data for the parameters.  Once the first model is run, it sets those values, so all other models with the same parameter name, must have the same types of data set in the parameter or you will get errors.

What that means is, if I look at the first example below BoxSize is expecting an integer, but in the model that it is running on now, it is formatted as a text parameter.  The data type must be the same in all models.

Error Examples

• An error occurred during export

Update:  10/1/2024 with preferred method

Error That error means that the file is too large to send back to the host via http so the config file needs to be modified to allow for larger file sizes. Task Error There was an exception running the extensions specified in the config file. ---> Maximum request length exceeded. If you exceed the default maximum file size which is 400000 you will need to fix a config file to accommodate processing larger file sizes, or enable uploading in chunks (preferred method).

Resolution Options

Preferred Method 

On the Task Server

Enable Upload in Chunks