My guess is you are playing your campaign with the mp EDU. Please start your EB with single player if you use the trivial script. If you don't, manually copy the Export_Descr_Units.txt from the folder sp game edu backup into your EB/Data.

AS for the script, take a look at EBBS.txt to give you an idea...

Spoiler Alert, click show to read: 


;========================================================
;Index:
;----------------------------------------
;1: Puppet ruler script
;2: Reforms
; 2a: Celtic Reforms
; 2b: Saka Reforms
; 2c: Roman Reforms
; 2d: Seleukid Cataphract Reforms
; 2e: Pan-Caucasus Empire Reform - Hayasdan
; 2f: Persia Reform - Hayasdan
; 2g: Carthage Reform
; 2h: Sweboz Reform
;3: Government Building Management
;4: Population Replenishment
;5: Money Assistance
; 5a: Difficult Start Help
; 5b: City Income Bonus
; 5c: Building Upkeep (disabled until decent balancing is done)
;6: Victory Conditions
; 6a: Flash VCs Script
; 6b: Victory Conditions Triggers
;7: Allied Cities Script
; 7a: Qarthadastim vs. Ptolemaioi (Ammonion)
; 7b: Attacks on Chersonesos (KH)
; 7c: Attacks on Byzantion (Pontos)
; 7d: Halikarnassos (Ptolemaioi)
; 7e: Kallatis (Getai)
; 7f: Qarthadastim vs. Ptolemaioi (Kyrene)
; 7g: Seleukids vs. Ptolemaioi (Kyrene)
; 7h: Nikaia (Pontos)
; 7i: Pantikapaion (KH)
; 7j: KH vs. Pontos (Sinope)
; 7k: Thermon (KH)
; 7l: Trapezous (KH)
; 7m: Qarthadastim vs. Romani (Messana)
;8: Special Events
; 8a: The Chersonesos Event
; 8b: Tomb Of Alexander
; 8c: Baktrian Independence
; 8d: Roman Triumph
; 8e: Seleukid Anabasis
; 8f: Pahlava Shahanshah
; 8g: Sweboz Triumphs
; 8h: Devastation Script
; 8i: Nomad Horse Discount
; 8j: Gauls - Epeiros Alliance
; 8k: Celtiberian Alliance
; 8l: Rhegion (Romani only)
; 8m: Spartan Agoge Messages
; 8n: Xanthippos
; 8o: Yuezhi Invasion
; 8p: Casse Landing
; 8q: Naravas
;9: Central European Defence
;10: Four Turns Per Year Script
;========================================================