Problems setting permissios with Acl

Hello, I'm following the tutorial to create a permissions sytem with
Auth and Acl, and I have problems (again) when I try to set
permissions...

I get an error "Invalid node", the error page here: http://pastebin.com/SyyeXUDq
,
the code of the function... here: http://pastebin.com/GGmR2Zsf
the ACOs tree:

[1] controllers
[2] Pages
[3] display
[4] add
[5] edit
[6] index
[7] view
[8] delete
[9] ActivityPrograms
[10] add
[11] edit
[12] index
[13] view
[14] delete
[15] Agreements
[16] add
[17] edit
[18] index
[19] view
[20] delete
[21] AgreementPatterns
[22] add
[23] edit
[24] index
[25] view
[26] delete
[27] Companies
[28] add
[29] edit
[30] index
[31] view
[32] delete
[33] CompanyTutors
[34] Degrees
[35] add
[36] edit
[37] index
[38] view
[39] delete
[40] Groups
[41] index
[42] view
[43] add
[44] edit
[45] delete
[46] Offers
[47] add
[48] edit
[49] index
[50] view
[51] delete
[52] OfferRequests
[53] add
[54] edit
[55] index
[56] view
[57] delete
[58] Students
[59] add
[60] edit
[61] index
[62] view
[63] delete
[64] Tutors
[65] add
[66] edit
[67] index
[68] view
[69] delete
[70] Users
[71] index
[72] login
[73] logout
[74] dashboard
[75] view
[76] add
[77] edit
[78] delete

Anyone that knows what I'm doing wrong? Thanks in advance :)

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