Execution Error

[kespears]

I'm following the LiveCode Tutorial to create a Notes App. I receive the following error in my card "list" when saving the note location and file information.

card "list": execution error at line 10 (Chunk: no such object), char 1

I'm using LiveCode 9.5

Thanks for any guidance.

Keith

[FourthWorld]

Do you have a field named "notesList" on that card?

[richmond62]

There is also a mismatch between lines 12 and 13:

tNotes and tNotesList

[bogs]

I have a question that I actually am not sure of in regards to this problem and your question, Richard.

If the handler is 'preOpenCard', doesn't that mean that there can't be ... any object created yet? The card isn't even open, if I understand the way a stack opens up

I might not be understanding it correctly though, which is why I am asking.

Edit - I must not understand how it opens, on testing I couldn't generate an error for the same handler putting empty into a named field

@Keith - link to the tutorial you are following? Also, I'd make sure that as Richard suggested, you actually have a field that is named "notesList", and doesn't contain a different name that is close, like "noteList". Typographical errors are buggers to track down.

[kespears]

Bogs, I'm using Livecode 8 Build App Tutorial. I was in the Displaying a Notes session. https://livecode.com/topic/displaying-t ... f-notes-4/

Richmond62, I will review the other stacks to see where “notesList” was created and ensure the names are correct, and take a look at the mismatch between 12 and 13.

Thanks
Keith

[richmond62]

Variables (unless explicitly declared as globals) are local to an operation

(i.e. notesList looks local to preOpencard).

[dunbarx]

We cannot see the few lines above what the OP posted. Perhaps variables are declared up there?

Keith?

Craig

[bogs]

Bogs, I'm using Livecode 8 Build App Tutorial.

Ah I see, this is a restricted tutorial that you actually paid to read!

I was thinking it was possibly a typographical error even in the tutorial, but I've never tried them myself.

[kespears]

Dunbarx and Richmond62, I will check my variables. Thanks.

Bogs, yes, this is one of the Paid tutorial. It's helpful, but maybe I missed a variable or 2. I'm checking. Thanks.

Thanks
Keith

[FourthWorld]

I have a question that I actually am not sure of in regards to this problem and your question, Richard.

If the handler is 'preOpenCard', doesn't that mean that there can't be ... any object created yet? The card isn't even open, if I understand the way a stack opens up

The preOpenCard message allows us to set things up before the card is displayed for the user. Any objects on the card are there and fully addressable, they just haven't been rendered to screen yet.

Edit - I must not understand how it opens, on testing I couldn't generate an error for the same handler putting empty into a named field

How did the test differ from the earlier run?

[jacque]

I'm following the LiveCode Tutorial to create a Notes App. I receive the following error in my card "list" when saving the note location and file information.

card "list": execution error at line 10 (Chunk: no such object), char 1

The mismatch in lines 12 and 13 is an error in the tutorial. There were a few of those throughout the sequence that didn't get caught and fixed. You can use either tNotes or tNoteslist but the two lines must use the same variable name. The first line puts a list of files into a variable and the second one puts the list in that variable into a field.

The "no such object" error means LC can't find a field named "noteslist" on the current card. Check the field name. If other handlers in the tutorial refer to the field as either "noteslist" or "list" then you'll have to fix that mismatch too.

[richmond62]

There were a few of those throughout the sequence that didn't get caught and fixed.

Whoops! Especially when that isn't a free resource.

[jacque]

Someone with the time needs to report it.

[bn]

The tutorial is correct.

taken from step "Displaying the list of notes"

step one
variables are ok,

step two
variables are ok

I guess Keith just jumped ahead and left out some steps

Kind regards
Bernd

[bn]

This is the script of step two

Code: Select all

on preOpenCard
   -- Declare any local variables
   local tNotes, tNoteName, tNoteTime, tNotesList
   
   -- Clear the "notesList" field
   put empty into field "notesList"
   
   -- Set the deafultFolder, telling LiveCode where to look for files
   set the defaultFolder to notesFolder()
   
   -- Get the list of files that are in the default folder
   put the detailed files into tNotes
   
   -- Sort the list of files by the modification date
   sort lines of tNotes descending by item 5 of each
   
   -- Build a list of notes in the form we want to display in the field
   -- Look at each line in the list of note files
   repeat for each line tNote in tNotes
      -- Get the name of the note file and the last modified date
      put character 1 to - 5 of urlDecode(item 1 of tNote) into tNoteName
      put item 5 of tNote into tNoteTime
      
      -- Convert the last modified date to a readable date
      convert tNoteTime to date
      
      -- Build the list of notes to be displayed
      put tNoteName & tab & tNoteTime & tab & ">" & return after tNotesList
   end repeat
   
   -- The last character is a return so delete it
   delete the last character of tNotesList 
   
   -- Put the formatted list into the "notesList" field
   put tNotesList into field "notesList"
end preOpenCard

it is "strict compilation compliant" i.e. all variables are declared and are correctly used.

Not that there might not be errors in some lessons but this code is ok.

Kind regards
Bernd