string - Generate frames for graphics.newImageSheet animation -

i try build function generates frames list graphics.newimagesheet. function print seemingly correct list "1,2,3,4,5.." graphics.newimagesheet reject following error:

warning: sequence (fastrun) has invalid index (0) falls outside rang e of valid image sheet frame indices: 1 <= index <= 9. 

code:

function generateframes(num)     numframes = num     frames = 1     i=2, numframes, 1         frames = frames .. "," ..     end end  sheetdata = { width=32, height=40, numframes=9, sheetcontentwidth=96, sheetcontentheight=120 }  mysheet = graphics.newimagesheet( "media/enemies/enemy-" .. type .. ".png", sheetdata)  generateframes(9)  print("frames: " .. frames)  sequencedata = {     { name = "fastrun", frames={ frames }, time=1000, loopcount = 0 } } 

don't use string in frames = {...}, use table.

function generateframes(num)     local frametable = {}     numframes = num     frames = 1     i=2, numframes, 1         table.insert(frametable,i)     end end  sheetdata = { width=32, height=40, numframes=9, sheetcontentwidth=96, sheetcontentheight=120 }  mysheet = graphics.newimagesheet( "media/enemies/enemy-" .. type .. ".png", sheetdata)  generateframes(9)  print("frames: " .. frames)  sequencedata = {     { name = "fastrun", frames=frames , time=1000, loopcount = 0 } }