Model Reader (current Knime version) doesn't accept flow variable for path

[ArminFan]

Hello,

since the newest Knime updates I’m having serious errors when reading files from my server.

In the old version I used the file chooser widget (so that a user could choose a file), but as default I selected a .model file via “Browse”:

Now when I use that variable in a model reader node:

I run in the error:

Locally everything is working fine, but when executed on the server it doesn’t work.

When I use the new Model Reader Node I can’t select my flow variable:

Is there any possibility that I can use the old deprecated nodes, because i don’t want to change hundreds of workflows. Thanks for your help.

Best regards
Armin

[mlauber71]

Have you tried executing the precious node and the try again to set the variable?

[ArminFan]

@mlauber71

You mean if I have executed the nodes before? Sure. But I don’t have the possibility to select my flow variable.

Furthermore I would appreciate to use the old version.

[ArminFan]

@mlauber71

I have reconstructed a minimal example. For example if I use the CSV Reader Node as following

it works locally, but on the server I run into:

[mlauber71]

@ArminFan I would recommend using relative paths or knime protocol paths.

https://docs.knime.com/latest/analytics_platform_file_handling_guide/index.html#introduction

You also could try and connect via:

KNIME Server Connector

And then build a path to a file that is always on the KNIME server by adding a blue connection to such a node

Create File/Folder Variables

I sometimes find the path and file handling not that intuitive but it should work. You have to always think about what your environment is and what paths the workflow can see at the moment.

This might also serve as an example

more fun with URI, URL and File Paths - work with the new Path variable...

I do not have access to our KNIME server at the moment so I cannot build a full example.

[ArminFan]

@mlauber71 thanks for your answer. This works in case of the csv reader, but not with the file chooser widget, because I have to select a file via “Browse” in the file choose widget and this selects an absolute path.

Furthermore I can’t give this path to the model reader node via a flow variable, because the new Model reader node (from the last update) doesn’t let me use that flow variable from the file chooser widget.

[mlauber71]

You could try and execute the workflow on the server a a new process and see what kind of selection it would run. Maybe you could also try this via the web interface.

Is there no chance that you could configure the position of the model? So you would not have to manually select it?