Several minor warnings in examples

[germa89]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

Several warnings/messages generated when building the docs.

• MAPDL 2D Plane Stress Concentration Analysis

py file worked fine, for the jypyter file: had to instal 'pip install ansys-mapdl-core' in the local drive the example directory existed

• 2D Pressure Vessel

py file worked fine, for the jypyter file: had to instal 'pip install ansys-mapdl-core' in the local drive the example directory existed

• Basic Thermal Analysis with pyMAPDL

"The example mentions ""First, start MAPDL as a service and disable all but error messages.""
But the code is: mapdl = launch_mapdl()
Instead of: mapdl = launch
_mapdl(loglevel=""ERROR"")"

• 3D Acoustic Analysis

"C:\Users\dtsalagr\AppData\Local\Temp\ipykernel_24268\2001064517.py:22: UserWarning: Matplotlib is currently using module://matplotlib_inline.backend_inline, which is a non-GUI backend, so cannot show the figure.
  fig.show()"

• Basic DPF-Core Usage with PyMAPDL

"Jupyter & Py file error: File ""C:\ProgramData\Anaconda3\lib\site-packages\ansys\dpf\gate\generated\data_processing_capi.py"", line 388, in data_processing_get_server_version_on_client
    raise errors.DPFServerException(sError.value)

DPFServerException: a service is currently unavailable error ocurred: failed
to connect to all addresses"

• Static simulation of double cantilever beam test via cohesive elements

Py file: last gif doesn't animate

• Cyclic Analysis

Jupyter error: AttributeErro
r: 'NoneType' object has no attribute 'GetNumberOfPoints'

• Static Cyclic Analysis

"Py & Jupyter error: MapdlRuntimeError: There is at least 1 small equation solver pivot term (e.g., at the UZ degree of freedom of node 423).  Please check for an insufficiently     
 constrained model."

• Plotting and Mesh Access

"Jupyter: 
MapdlRuntimeError: 

*** ERROR ***                           CP =       0.000   TIME= 00:00:00
 Element type 1 is not the same shape as SOLID187.  Switching to a       
 different shape is not allowed while elements of type 1 exist."

Other warnings:

• General jupyter warning:

--
C:\Users\dtsalagr\AppData\Local\Programs\Python\Python39\lib\site-packages\pyvista\jupyter\notebook.py:60: UserWarning: Failed to use notebook backend:
 
Please install `ipyvtklink` to use this feature: https://github.com/Kitware/ipyvtklink
 
Falling back to a static output.
warnings.warn(
 
when I installed the package I ran into an error regarding javascript on the jupyter page, had to uninstall it

📝 Steps to reproduce

Running the examples.

This come from internal feedback. If needed, ping Massimo Capidiferro.

💻 Which operating system are you using?

Windows

🐍 Which Python version are you using?

3.7

📦 Installed packages

NA

[clatapie]

These errors are located in the examples of the PyMAPDL repository. This issue is closed to be opened in the PyMAPDL one as ansys/pymapdl#1927.