How to properly create containers.Map of string as keys and structs as values?

I have the following code:

    [~,~,table] = xlsread(book,sheet);
    % Drop the Ticker field, because it will be used as key.
    fields = table(1,2:end);
    % Use tickers as keys 
    K = table(2:end,1);
    % the values are structures containing several info related to the key
    % ticker.
    V = cell2struct(table(2:end,2:end),fields,2);
    %D = containers.Map ('KeyType','char','ValueType', 'any');
    D = containers.Map(K,V);

    V = 

    2x1 struct array with fields:

        OpeningTime
        ClosingTime
        LabDays
        Currency
        CpOrd
        Commission
        IM
        MM
        Tendency
        Period
        Depth
        RelProduct
        RelWeight
        Revision

and K =

    'XAUUSD'
    'XAGUSD'

but I have the following error message:

    Error using containers.Map
    Specified value type does not match the type expected for this container.

How can I fix it to get a Map indexed by means of a string and it get me the whole structure?