Opening an existing siaqodb instance on Windows Phone -

i manage create database , use it, exception when trying initiate existing one.

var store = new siaqodb("storageplace"); 

additional information: genericarguments[0], 'system.nullable`1[system.double]', on '#=qestot0z3wa12drpji9vycgxf14qudof1q8lag3hgemk=[#=qcmb_qbvbwsh22$$jqwsgoa==]' violates constraint of type '#=qcmb_qbvbwsh22$$jqwsgoa=='.

any suggestions?

you added index on nullable types. indexes on nullable types not supported.