4,547 Warnings & 10 Errors

Hello CodeIgniters,

I'm new to CodeIgniter, so please forgive my ignorance.

I downloaded CodeIgniter-3.1.5, unzipped it to a new directory and then opened it with Eclipse PDT (Oxygen).

Without writing a single line of code I was presented with 4,547 warnings & 10 errors.
Deleting the User Guide (It uses frames?) reduced it to just 10 errors & 9 warnings. 
(See the two screenshots below.)

Questions:

• Can anyone tell me if these errors are true/false?
  
• Is there any way to resolve these errors?
  
• Is this just a consequence of using Eclipse PDT?
  
• If so, then what's the best IDE to use with CodeIgniter please?
  

Thanks in advance.

Best Regards

I'm using PDT oxygen and I've never seen any of that kind of error before.
have you tried setting your project "PHP Version" into 5.6 or less ?
or if you choose "User default PHP settings" in the project properties,
have you tried changing your OS's php environment path into a php version that is 5.6 or less?

also, Netbeans PHP Platoform.
PDT is kind'a inferior to Netbeans PHP in regards to feature such as Composer support,
Framework's Support, etc.