prompts.NewChatPromptTemplate return prompt

[deweizhang12138]

hello, I use code : `package main

import ( "context" "fmt"

"github.com/tmc/langchaingo/llms"
"github.com/tmc/langchaingo/llms/ollama"
"github.com/tmc/langchaingo/prompts"

)

func main() {

prompt := prompts.NewChatPromptTemplate([]prompts.MessageFormatter{
    prompts.NewSystemMessagePromptTemplate(
        "你是一个只能翻译的文本引擎，不需要不需要进行解释。", nil),
    prompts.NewHumanMessagePromptTemplate(
        `翻译这段文字到 {{.outputLang}}: {{.text}}`, []string{"outputLang", "text"}),
})

vals := map[string]any{
    "outPutLang": "英文",
    "text":       "今天天气真不错",
}

fmt.Println(vals)

messages, err := prompt.FormatMessages(vals)
if err != nil {
    fmt.Println(err)
    return
}

}`

messages, err := prompt.FormatMessages(vals) have a bug:

`panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x7a81c7]

goroutine 1 [running]: github.com/tmc/langchaingo/prompts.ChatPromptTemplate.Format({{0xc00003ff18?, 0xc00011c020?, 0xc00003ff08?}, 0x0?}, 0x1?) /home/dewei/go/pkg/mod/github.com/tmc/langchaingo@v0.1.9/prompts/chat_prompt_template.go:45 +0x27 main.main() /home/dewei/workspace/test/gollama/main.go:34 +0x35b exit status 2 `

help me please

[devalexandre]

this are correct code

package main

import (
    "fmt"
    "github.com/tmc/langchaingo/prompts"
)

func main() {
    prompt := prompts.NewChatPromptTemplate([]prompts.MessageFormatter{
        prompts.NewSystemMessagePromptTemplate(
            "你是一个只能翻译的文本引擎，不需要不需要进行解释。", nil),
        prompts.NewHumanMessagePromptTemplate(
            `翻译这段文字到 {{.outputLang}}: {{.text}}`, []string{"outputLang", "text"}),
    })

    vals := map[string]any{
        "outputLang": "英文", // Corrected key here to match template usage
        "text":       "今天天气真不错",
    }

    fmt.Println(vals)

    messages, err := prompt.FormatMessages(vals)
    if err != nil {
        fmt.Println(err)
        return
    }

    fmt.Println(messages)
}

[devalexandre]

@deweizhang12138 ?