Here's what is means:
true && true; % This works, and gives a scalar result
[true true] && [true false]; % This gives the error you see
The && and || operators are "short-circuit logical operators". They can be used only on scalar values -- not vectors -- because they have to be able to evaluate to simply a single true or false value, not a vector of values.
If you want a vector of logical values, you should use
[true true] & [true false]; % This works, and gives a vector result
