Library can't get included, can't save the new program

Projects General Guidance
1

Hi friend's I'm a beginner, + please help me with the following issues.
First, I opened a new .ino file it itself named as "sketch _mar18a" and after entering the code I try to save but it's promoting "File not Found. Check the file name and try again".
I created a folder with the same name in Arduino folder even though it making the same error.

2

Please try this:

  • File > Save as...
  • In the "File name" field, enter a unique name for your sketch.
  • Click "Save".