#5045 [BUG] Improve error when missing type annotations in task/workflow Issue created by cjidboon94 ### Describe the bug When I tried to register my workflows that had some incorrect type annotations (using = instead of :) the error messaging, pyflyte gave me a large error message which to me didn't immediately make clear what was wrong. Here's a code example of what I did wrong

from flytekit import workflow

@workflow
def mywf(first=str, second=str):
  ...

instead of

from flytekit import workflow

@workflow
def mywf(first:str, second:str):
  ....

Here's the stacktrace

:
Failed with Unknown Exception <class 'TypeError'> Reason: isinstance() arg 2 must be a type, a tuple of types, or a union
Traceback:
  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/clis/sdk_in_container/utils.py", line 139, in invoke
    return super().invoke(ctx)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/clis/sdk_in_container/register.py", line 202, in register
    raise e

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/clis/sdk_in_container/register.py", line 183, in register
    repo.register(

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/tools/repo.py", line 264, in register
    registrable_entities = load_packages_and_modules(

  File "<<root>>envs/flyte/lib/python3.10/site-packages/flytekit/tools/repo.py", line 183, in load_packages_and_modules
    registrable_entities = serialize(pkgs_and_modules, ss, str(project_root), options)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/tools/repo.py", line 48, in serialize
    registrable_entities = get_registrable_entities(ctx, options=options)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/tools/serialize_helpers.py", line 60, in get_registrable_entities
    lp = LaunchPlan.get_default_launch_plan(ctx, entity)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/core/launch_plan.py", line 93, in get_default_launch_plan
    parameter_map = transform_inputs_to_parameters(ctx, workflow.python_interface)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/core/interface.py", line 233, in transform_inputs_to_parameters
    default_lv = TypeEngine.to_literal(ctx, _default, python_type=interface.inputs[k], expected=v.type)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/core/type_engine.py", line 1111, in to_literal
    transformer.assert_type(python_type, python_val)

  File "<<root>>/envs/flyte/lib/python3.10/site-packages/flytekit/core/type_engine.py", line 154, in assert_type
    if not hasattr(t, "__origin__") and not isinstance(v, t):

isinstance() arg 2 must be a type, a tuple of types, or a union

### Expected behavior It would have been helpful if the stacktrace had contained: • the line of my workflow file which it caused it to error • a clearer error message (e.g.

TypeAnnotation missing for input X of workflow/task Y

or

no Type found for input X of workflow/task Y

) ### Additional context to reproduce See code examples above ### Screenshots No response ### Are you sure this issue hasn't been raised already? • Yes ### Have you read the Code of Conduct? • Yes flyteorg/flyte