error: There is no block named 'xpcutilitieslib/Byte Packing' (when using add_block(​'xpcutilit​ieslib/Byt​e Packing', 'mySlx/pack')

what a trick

got error:

There is no block named 'xpcutilitieslib/Byte Packing'

when:

add_block('xpcutilitieslib/Byte Packing', 'mySlx/pack')

but adding a ''space'' after the block name "Byte Packing" it all goes right

add_block('xpcutilitieslib/Byte Packing ', 'mySlx/pack')

using matlab/simulink 2019b

ToT

:)