read!( ) not working for HDF5 file

[raman-maker]

I have an HDF5 file. I open it as

h5 = h5open(h5file, "r")

and initialize r as

r = zeros(Float32,18)

when i read!() fuction

read!((h5["x1v"])[:, 1], r)

i get following error.

ERROR: LoadError: MethodError: no method matching read!(::Vector{Float32}, ::Vector{Float32})
The function read! exists, but no method is defined for this combination of argument types.

How to make it read so that to reduce allocations? I have posted this issue on Julia discourse https://discourse.julialang.org/t/read-not-working-for-hdf5-file/129722