Error While invoking text2pdf function

[suraja1520]

I have copied the PRIVATE_KEY to the folder fn-text2pdf, the function got deployed successfully.
But when i tried to invoke the function it is giving me below error-:
savatar-mac:fn-text2pdf savatar$ echo -n 'lorem.txt' | fn invoke text2pdf convert
{"Message":"Unable to read private Key","Error":"open /function/savatar_function_private_key.pem: permission denied"}

Can you please comment on this. Did i miss any steps?

Thanks in Advance.