Orgmode 2017 "binding depth exceeds max-specpdl-size"?

Question

I've just installed the latest version of Orgmode (20170515) from the package list of elpa (M-x package-list-packages, marked I then x).

Now, when I try to export an *.org file to a *.pdf by either pressing C-c C-e or via Org menu, I get an error msg that says:

Symbol's function definition is void: org-define-error

What does it mean? How do I get the export buffer back? (I'm trying to export an org file to pdf via tex)

I'm on Windows 7 and I think I previously had Org 8.0 (can't remember...).

Can someone kindly please help me?

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EDIT

Today, the command C-c C-e now displays the buffer for export options (a set of keyboard combos to export in pdf or HTML) BUT when I select l o I get this msg:

 org-get-limited-outline-regexp: Variable binding depth exceeds max-specpdl-size

Anyone knows what this means? And how do I fix it?

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EDIT 2

I added these lines to my .emacs file and told emacs to 'Evaluate the buffer'.

(setq max-specpdl-size 5)  ; default is 1000, reduce the backtrace level
(setq debug-on-error t)    ; now you should get a backtrace

This is the response:

Debugger entered--Lisp error: (void-variable speedbar)
  eval(speedbar nil)
  eval-last-sexp-1(nil)
  eval-last-sexp(nil)
  call-interactively(eval-last-sexp nil nil)
  command-execute(eval-last-sexp)

I've purposely omitted typing in C-h a as this was causing some other kind of error:

Debugger entered--Lisp error: (void-variable C-h)
  eval-buffer()  ; Reading at buffer position 840
  call-interactively(eval-buffer nil nil)
  command-execute(eval-buffer)

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UPDATE 3

On Nick's suggestion I changed those line in my .emacs file. Now it looks like this:

(setq max-specpdl-size 5000)  ; default is 1000, reduce the backtrace level
(setq debug-on-error t)    ; now you should get a backtrace
;;C-h a

And this is what the buffer says following another attempt to export from org to pdf: (this is after recompiling all elpa installed pkgs)

Answer 1

http://orgmode.org/manual/Installation.html:

Recent Emacs distributions include a packaging system which lets you install Elisp libraries. You can install Org with M-x package-install RET org.

Important: you need to do this in a session where no .org file has been visited, i.e., where no Org built-in function have been loaded. Otherwise autoload Org functions will mess up the installation.

So it looks like your initial installation was indeed messed up. To avoid this, you should start Emacs as emacs -Q before calling package-install for org.