Hi Varvara,

I find this confusing also: but I think to my understanding the message is actually saying something like:

"I looked for the Rule Called <XYZ> and I couldn't find it anywhere : I even checked all the way back to root (@baseclass)"

In anycase: I am able to demonstrate the error and how to avoid it below:

Here's an example on 719 which shows an Activity running a 'Show-Stream' method ; it will look for a HTML RULE and display it.

The HTML RULE and the Activity live in the same CLASS Structure which is "tmp-scratch-work' in this example:

The Stream Rule is just a 'hello world' file like this:

And the Activity is just a two-stepper:

Which defines a single Page (which again has the same class as both the Stream Rule and the Activity itself):

If I run this Activity - the Stream Rule is found and displayed correctly: and this pattern seems to work well regardless of PRPC version.

If I now modify my Activity , so that it does not create the Page 'MyContextPage' (I'm still keeping the definition on 'Pages and Classes' and I'm still referencing it as a 'Step Page' on my Step) like this:

And (since I didn't remember to do a Page-Remove in my Activity [which is a bad habit !]), I must now remove it manually for this test to work:

And now I re-run the Activity - which no longer creates a Page : we get an error:

( The error tells me to consult with my system administrator ; but I've never met them  - so I guess it must mean me..... )

I checked the PRPC logs and I can see the error as:

[...]blah blah

Caused by: com.pega.pegarules.pub.generator.RuleNotFoundException: Failed to find instance @baseclass.TestStream of type Rule-Obj-HTML.

    at com.pega.pegarules.generation.internal.assembly.FUAInstance.getRules(FUAInstance.java:2127)

    at com.pega.pegarules.generation.internal.assembly.FUAInstance.getRules(FUAInstance.java:2011)

    at com.pega.pegarules.generation.internal.assembly.FUAInstance.getClassSource(FUAInstance.java:2310)

    at com.pega.pegarules.generation.external.assembly.Assembler.getClassSource(Assembler.java:945)

blah blah[...]

Now: one other test on 719: I can remove the step completely - and everything starts working again:

But I have vague memory that different versions of PRPC are subtley different here.

That is: I believe I remember seeing different behaviours with regard to :

1. An Empty Step Page.

2. Pages Defined on 'Step Page', but not explicitly created.

3. Pages Not Defined, but still referenced on the Step Page.

So : wherever possible - I tend to stick to the explicit pattern above: that is  defining, creating and referencing exactly the page : I have found that doing this - means the Activity works in the same way the same across all versions of PRPC that I have tried....

Cheers

John