I think you are trying to shape in two places. First, you are shaping in class of a policy-map, and then you are applying this policy map as a child map of another shaped policy map.
This is two level hierarchy.
Your IOS does not support this, so it writes, that you can shape only at a first level.
e.g.:
Policy-map LEVEL2
class HTTP
shape average 256000
class class-default
Policy-map LEVEL1
class class-default
shape average 512000
service-policy LEVEL2
I named the maps to show you which level is which. So you can shape only at first level map, not at the second level one.
For more info, refer to this document:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hqos_c/part20/ch10/qsbcbts.htm#wp1027195
hope this helps.
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