# Frontend Type Error : attempt to hash a value of unsupported type

**URL:** <https://forum.dfinity.org/t/frontend-type-error-attempt-to-hash-a-value-of-unsupported-type/8446>\
**Category:** Programs & Applications\
**Created:** [November 8, 2021, 4:49pm UTC](https://forum.dfinity.org/t/frontend-type-error-attempt-to-hash-a-value-of-unsupported-type/8446 "2021-11-08T16:49:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![C-B-Elite](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/c-b-elite/32/34356_2.png) [@C-B-Elite](https://forum.dfinity.org/u/C-B-Elite)\
**Post date:** [November 8, 2021, 4:49pm UTC](https://forum.dfinity.org/t/frontend-type-error-attempt-to-hash-a-value-of-unsupported-type/8446/1 "2021-11-08T16:49:37Z")

</div>

I meet an error that when I want to createActor :

 ![2021-11-09 00-38-09屏幕截图](https://us1.discourse-cdn.com/flex023/uploads/dfn/original/2X/4/4120ce9acdd399dfad59f2c4b756137ec6a8e3a2.png)  
The error is :  
 ![7dafa51f924b833b0b956cb25051ab9](https://us1.discourse-cdn.com/flex023/uploads/dfn/original/2X/b/b4cd5f87df2e795b400566a8630a1c914e25bb0e.jpeg)  
Error Text : attempt to hash a value of unsupported type  
I can not figure out what happened and don’t know how to handle this error

Develop Environment :  
agent-js version : 0.10.1