Question: Error loading Physics in Maple 2019

When I load the Physics package - with (Physics)- I get the following error message:

r level initialization for package `Physics' failed: Heaviside not defined for non-real values

Later on while executing some code there may pop a plethora of other errors with apparently no relation to the running code. No problem for p.e. PDETools. Ihave loaded the 348 physics upgrade but it happened also with 347. Any Idea what it is and what to do?

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