Hello. New here. I got a problem. Ladybug / Dynamo

Hello everyone.
Im just starting in this Dynamo and Ladybug tools.
I am following instructions for a sun analysis. but i get this Error.

ERROR:
Invalid literal for float():DynamoCoreRuntime2.8.0

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Traceback (most recent call last):
File “” Line 54 in
File “” line 17, in tryGetPluginPath
ValueError: Invalid literal for float(): DynamoCoreRunetime2.8.0

If any1 could help me.