Test of Homogeneity of Variancesa
Sinusoid2.5Hz4
Levene Statistic df1 df2 Sig.
.b 1 . .
a Test of homogeneity of variances cannot be performed for Sinusoid2.5Hz4 because the sum of caseweights is less than the number of groups.
b Groups with only one case are ignored in computing the test of homogeneity of variance for Sinusoid2.5Hz4.

I have no idea to fix it. Please help me, I am so desperate.