[MIT App Inventor] 902 error: screen not found.

[Cruise105]

I already saw this on an old topic yet I wasn't able to tell if it was correctly solved.

I am attempting to create an app that has a total of 8 screens. The first 6 screens work perfectly fine, however the last two (upon clicking to button) give me "Error 903: screen not found" message. I know for a fact that these screens are there, because I have already put information into them. 

Attached is a screen shot of my blocks. Is there anything you can figure out that I am doing incorrectly.

App Name: Fable3HiddenItems

[Taifun]

names are case sensitive, check your screen names for typos

Taifun

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Trying to push the limits of App Inventor! Snippets and Tutorials from Pura Vida Apps by Taifun.         

[Cruise105]

I have checked that multiple times. I even removed the blocks and put them back twice. It is still giving me the same error message.

[Abraham Getzler]

Check your text blocks to see if they contain blanks,

by running a right-click-DoIt against a length() on them.

Blanks are hard to spot.

ABG

[Abraham Getzler]

If you want to try a little surgery on an .aia export ...

https://groups.google.com/d/msg/app-inventor-developers-library/kHEFtUiJsQM/obxo_CKizTcJ

Once you have reached the point of showing your screen names in their .aia src subdirectory,

you can F2-rename them in Windows Explorer, CtrlC copy their names,

then paste the names into text blocks in the Blocks Editor.

Compare the two text blocks in the emulator.

ABG