ERROR: no applicable method for "TukeyHSD"

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Why do I see this error?
Because there _is_ no applicable method.

Please don't name objects after R functions, but in your case you need to
do

class(aov)
?TukeyHSD
?aov

and see what TukeyHSD says it handles and what aov says it returns.

This question has been answered at length on this list quite recently, so 
please also search the archives.
library(stats)
require(stats)
[1] TRUE
tHSD <- TukeyHSD(aov)
Error in TukeyHSD(aov) : no applicable method for "TukeyHSD"

In case it helps:

aov
Call:
aov(formula = roi ~ (Cue * Hemisphere) + Error(Subject/(Cue *
   Hemisphere)), data = roiDataframe)

Grand Mean: 8.195069

Stratum 1: Subject

Terms:
               Residuals
Sum of Squares   645.7444
Deg. of Freedom         7

Residual standard error: 9.604645

Stratum 2: Subject:Cue

Terms:
                    Cue Residuals
Sum of Squares  0.386987  4.015740
Deg. of Freedom        1         7

Residual standard error: 0.7574148
1 out of 2 effects not estimable
Estimated effects are balanced

Stratum 3: Subject:Hemisphere

Terms:
               Hemisphere Residuals
Sum of Squares    153.4860  827.6699
Deg. of Freedom          1         7

Residual standard error: 10.87376
1 out of 2 effects not estimable
Estimated effects are balanced

Stratum 4: Subject:Cue:Hemisphere

Terms:
               Cue:Hemisphere Residuals
Sum of Squares        5.085930  4.279707
Deg. of Freedom              1         7

Residual standard error: 0.7819122
Estimated effects are balanced

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