Getting error for accessing Cloud services with Mathematica version 10

Questions
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1

Hello,

I am trying with Trial version of Mathematica 10. I wanted to see cloud access features.
I tried following function through Notebook:

CloudDeploy[
 Manipulate[
  ContourPlot3D[
   x^2 + y^2 + a z^3 == 1, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}, 
   Mesh -> None], {a, -2, 2}]]

It asked for Wolfram ID and password. When I entered, it accepted with no error.
But then it aborted the execution with the following error:

Mathematica: nv50_tgsi_to_nc.c:978: emit_store: Assertion `reg->Register.Index < 64' failed.
Aborted (core dumped)

Please suggest if I am missing some steps. What can I do to try successful cloud deploy features
(including both deployment and execution).

Thanks,
Dr. S. Sarkar

2

I am also getting following error now:

General::unavail: ExportString is not available in this version of the Wolfram Language.

Can I please get some help how to install ExportString for a trial version of Mathematica 10.4.