Python actions in Photoshop 2019 cc not working.

[mltburger]

Can anyone shed some light on this problem.

We have a Python script that calls Actions to convert CMYK tiffs, firstly to Greyscale, then it merges the tiff into 1 tiff, before changing the resolution to 660.4dpi. This script worked perfectly fine in Photoshop cc.

Upgrading to Photoshop cc 2019, at seemingly random points when running the actions, we get the following meassages;

 

 

We have re-recorded the actions in cc2019, but no joy. Just to emphasis nothing has changed regarding the scripts or the tiffs. 

The four Tiffs= indexed colour/8 bits channel

The python script then calls the actions (screen shot below).

# open each tif plate in photoshop and convert to greyscale
plateC = psApp.Open(Ctif)
psApp.DoAction( "Greyscale", "SheetTileProduct")
plateM = psApp.Open(Mtif)
psApp.DoAction( "Greyscale", "SheetTileProduct")
plateY = psApp.Open(Ytif)
psApp.DoAction( "Greyscale", "SheetTileProduct")
plateK = psApp.Open(Ktif)
psApp.DoAction( "Greyscale", "SheetTileProduct")
# merge all CMYK tifs to form a combined CMYK tif
psApp.DoAction( "Merge", "SheetTileProduct")

Firstly turning each tiff to Greyscale.  

The next action merges the 4 greyscale tiffs into 1 tiff

The next action then changes the resolution of the tiff to 660.4dpi.

Just to repeat this all worked fine before moving to Photoshop cc2019.

[c.pfaffenbichler]

Please try to better explain the process (in particular what is »then it merges the tiff into 1 tiff« supposed to mean?), provide more info about the involved Actions (and the steps included therein) and post sccreenshots (including the pertinent Panels like Layers, Channels, Actions, …) of the moment the Photoshop-alerts pop up with the Action ecpanded in the Actions Panel. 

[mltburger]

I have four Tiffs, that are indexed colour /8 bits channel

[c.pfaffenbichler]

Are they indexed or 8bit/channell?

[PECourtejoie]

HEllo, are you running Photoshop CC 20.0.6, the latest version?

[mltburger]

Running Photoshop CC 20.0.5

[PECourtejoie]

I'd first try to update, then...

[PECourtejoie]

Why are you running a Python script? An action can call another action, if needed, that would remove a parameter.

Also, does the actions work on their own?