# Internal compiler error: Unable to determine ID for log instance. during building of predicate

**URL:** <https://forum.fuel.network/t/internal-compiler-error-unable-to-determine-id-for-log-instance-during-building-of-predicate/2290>\
**Category:** Sway\
**Created:** [April 10, 2023, 12:57am UTC](https://forum.fuel.network/t/internal-compiler-error-unable-to-determine-id-for-log-instance-during-building-of-predicate/2290 "2023-04-10T00:57:22Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![fuel](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/fuel/32/1677_2.png) [@fuel](https://forum.fuel.network/u/fuel)\
**Post date:** [April 10, 2023, 12:57am UTC](https://forum.fuel.network/t/internal-compiler-error-unable-to-determine-id-for-log-instance-during-building-of-predicate/2290/1 "2023-04-10T00:57:22Z")

</div>

Hi guys build of this predicate

```auto
predicate;

use std::{
    inputs::input_owner,
    logging::log,
};

const RECEIVER_CONFIG: b256 = 0x5d99ee966b42cd8fc7bdd1364b389153a9e78b42b7d4a691470674e817888d4e;

fn main() -> bool {
    const RECEIVER = Address::from(RECEIVER_CONFIG);
    log::<Address>(input_owner(0).unwrap());
    log::<Address>(input_owner(1).unwrap());
        
    true
}

```

Gives me this error

```auto
^^/p/f/l/s/p/o/vGx8NIeAtmcrErOEa3Z4rIORovU1i0 >>> forc build (1) (*master+78) 01:54:15 
  WARNING! unused manifest key: project.target
  WARNING! unused manifest key: project.target
  WARNING! unused manifest key: project.target
  WARNING! unused manifest key: project.target
  WARNING! unused manifest key: project.target
  WARNING! unused manifest key: project.target
  WARNING! unused manifest key: constants
  WARNING! unused manifest key: constants
 Compiling library core (/Users/alexey/.forc/git/checkouts/std-9be0d6062747ea7/607ac50176db8bef936f91bacf435d0ea37d041e/sway-lib-core)
 Compiling library std (git+https://github.com/fuellabs/sway?tag=v0.37.0#607ac50176db8bef936f91bacf435d0ea37d041e)
 Compiling predicate swap-predicate (/Users/alexey/projects/fuel/limit_orders/services/predicate-orders-builder/orders/vGx8NIeAtmcrErOEa3Z4rIORovU1i0)
error
 --> /Users/alexey/.forc/git/checkouts/std-9be0d6062747ea7/607ac50176db8bef936f91bacf435d0ea37d041e/sway-lib-std/src/logging.sw:8:5
  |
6 | 
7 | pub fn log<T>(value: T) {
8 | __log::<T>(value);
  | ^^^^^^^^^^^^^^^^^ Internal compiler error: Unable to determine ID for log instance.
Please file an issue on the repository and include the code that triggered this error.
9 | }
  |
____

  Aborting due to 1 error.
Error: Failed to compile swap-predicate

```

---

<div class="post-metadata">

**Author:** ![sarah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/sarah/32/13_2.png) [@sarah](https://forum.fuel.network/u/sarah)\
**Post date:** [April 10, 2023, 2:44pm UTC](https://forum.fuel.network/t/internal-compiler-error-unable-to-determine-id-for-log-instance-during-building-of-predicate/2290/2 "2023-04-10T14:44:42Z")

</div>

Logs are not allowed in predicates.