A PHP Error was encountered

Severity: Warning

Message: count(): Parameter must be an array or an object that implements Countable

Filename: models/Catalog_model.php

Line Number: 620

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/models/Catalog_model.php
Line: 620
Function: _error_handler

File: /var/www/html/application/models/Catalog_model.php
Line: 652
Function: get_survey_path

File: /var/www/html/application/controllers/Study.php
Line: 234
Function: get_survey_path_full

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

Line #620 of /var/www/html/application/models/Catalog_model.php
```
_error_handler()
```
Line #652 of /var/www/html/application/models/Catalog_model.php
```
Catalog_model->get_survey_path()
```
Line #234 of /var/www/html/application/controllers/Study.php
```
Catalog_model->get_survey_path_full()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Study.php

Line Number: 362

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/controllers/Study.php
Line: 362
Function: _error_handler

File: /var/www/html/application/controllers/Study.php
Line: 274
Function: render_page

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

Line #362 of /var/www/html/application/controllers/Study.php
```
_error_handler()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Study.php

Line Number: 363

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/controllers/Study.php
Line: 363
Function: _error_handler

File: /var/www/html/application/controllers/Study.php
Line: 274
Function: render_page

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

Line #363 of /var/www/html/application/controllers/Study.php
```
_error_handler()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Study.php

Line Number: 364

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/controllers/Study.php
Line: 364
Function: _error_handler

File: /var/www/html/application/controllers/Study.php
Line: 274
Function: render_page

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

Line #364 of /var/www/html/application/controllers/Study.php
```
_error_handler()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Study.php

Line Number: 366

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/controllers/Study.php
Line: 366
Function: _error_handler

File: /var/www/html/application/controllers/Study.php
Line: 274
Function: render_page

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

Line #366 of /var/www/html/application/controllers/Study.php
```
_error_handler()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Study.php

Line Number: 367

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/controllers/Study.php
Line: 367
Function: _error_handler

File: /var/www/html/application/controllers/Study.php
Line: 274
Function: render_page

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

Line #367 of /var/www/html/application/controllers/Study.php
```
_error_handler()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /var/www/html/application/core/MY_Exceptions.php:195)

Filename: core/Common.php

Line Number: 570

Backtrace:

File: /var/www/html/application/core/MY_Exceptions.php
Line: 185
Function: include

File: /var/www/html/application/core/MY_Exceptions.php
Line: 121
Function: set_status_header

File: /var/www/html/application/controllers/Study.php
Line: 515
Function: show_error

File: /var/www/html/application/controllers/Study.php
Line: 274
Function: render_page

File: /var/www/html/index.php
Line: 348
Function: require_once

Backtrace

```
_error_handler()
```
Line #570 of /var/www/html/system/core/Common.php
```
header()
```
Line #121 of /var/www/html/application/core/MY_Exceptions.php
```
set_status_header()
```
Line #417 of /var/www/html/system/core/Common.php
```
MY_Exceptions->show_error()
```
Line #515 of /var/www/html/application/controllers/Study.php
```
show_error()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```

Error

An Error Was Encountered

DATASET-TYPE-NOT-SUPPORTED:

Backtrace

Line #515 of /var/www/html/application/controllers/Study.php
```
show_error()
```
Line #274 of /var/www/html/application/controllers/Study.php
```
Study->render_page()
```
Line #532 of /var/www/html/system/core/CodeIgniter.php
```
Study->related_materials()
```
Line #348 of /var/www/html/index.php
```
require_once()
```