Apache SOLR Error - php

I'm trying to work with SOLR on our Drupal 7 server, but I keep getting an error and I don't know what it means:
Exception: HTTP 400; orgapachelucenequeryParserParseException_Cannot_parse__AND_sm_field_product_type_TO__AND__OR_sm_field_product_type1_Encountered_____at_line_1_column_1_Was_expecting_one_of_____NOT______________________________QUOTED______TERM______PREFIXTERM______WILDTERM__________________NUMBER______TERM____________: orgapachelucenequeryParserParseException_Cannot_parse__AND_sm_field_product_type_TO__AND__OR_sm_field_product_type1_Encountered_____at_line_1_column_1_Was_expecting_one_of_____NOT______________________________QUOTED______TERM______PREFIXTERM______WILDTERM__________________NUMBER______TERM____________ in DrupalApacheSolrService->checkResponse() (line 455 of /vagrant/docroot/sites/all/modules/contrib/apachesolr/Drupal_Apache_Solr_Service.php).
The website encountered an unexpected error. Please try again later.
Does anyone know what the error means and how I would go about resolving it?

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installation of the symfony framework

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[Web server] [07-Apr -2021 06:27:42 Europe / Berlin] 2021-04-07T06: 27: 42 + 02: 00 [critical] Error not caught: syntax error, "|" unexpected, expected variable (T_VARIABLE)
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here are the errors obtained need help please
I do not know what to do
Thank you!
I guess it is the PHP version as well, because the Stack Trace shows a syntax error for the union types syntax (https://php.watch/versions/8.0/union-types) featured in the newest version 8 of PHP.

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I first started getting errors saying that the Model can't be found, (i am still trying to fix this)
https://stackoverflow.com/posts/comments/103619729?noredirect=1
and now the latest error i get when going to a different page on my site i get
An uncaught Exception was encountered
Type: ParseError
Message: syntax error, unexpected ''
File: public_html/index.php
Line: 319
Function: require_once
I then looked at index.php and the line in question is :
require_once BASEPATH.'core/CodeIgniter.php';
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Please help!

Error when modifying some settings in Drupal 7

I tried to add a field to be generated in an XML feed of articles but I got this error:
ErrorThe website encountered an unexpected error. Please try again later
Error messagePDOException: SQLSTATE[08004] [1040] Too many connections in lock_may_be_available() (line 192 of.....
I get this error often when I modify something in Drupal 7.

fixing Zend2 Framework 404 error has now given me fatal error: ModuleEvent::setModuleName expects a string as an argument; integer provided'

Fatal error: Uncaught exception '`Zend\ModuleManager\Exception\InvalidArgumentException' with message 'Zend\ModuleManager\ModuleEvent::setModuleName expects a string as an argument; integer provided' in C:\wamp\www\zf2-tutorial\vendor\zendframework\zend-modulemanager\src\ModuleEvent.php on line 64***
I'm new to Zend and trying the Skeleton application exercise
On attempting to load http://zf2-tutorial.localhost/album I was getting error
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So I then followed some suggestions on Stackoverflow and it seems to have messed things up altogether for me.
One suggestion was to put die('here'); in the indexAction to see what error shows up. So I tried it, got the above error and then deleted the same line again from indexAction.
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Undefined offset: 3 error is thrown but error location is not shown

i am getting this error Undefined offset: 3
in brief the message is like this,
Internal Server Error
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An internal error occurred while the Web server was processing your request. Please contact the webmaster to report this problem.
Thank you.
I would like to know from where does it happen or how to see the exact location of this issue so that i can easily go and resolve it. i am using Yii framework but sadly it doesnt display me from where this error occurs.
Do i need to have php error logs enabled to see this ?
Internal Server Error basically occurs on the server connection. And this seems some of the input missing to complete your functionality.
Basic i dont have idea on your code and functionality. So you are the person working on the functionality. You need to check the last functionality you worked in this.
Better to do the step by step debug process to resolve this.

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