I am not sure what standard error you have in mind, but there are some post-hoc options under the red triangle for each effect (found under "Effect Details" if "Minimal Report" is chosen) in the report. There you can also find LS Means standard errors whereas the parameter standard errors are listed under "Parameter Estimates" and "REML Variance...".
Below is a sample script illustrating Tukey HSD test for differences among subjects in a repeated measure model.